drush si --config-dir="/var/www/html/config" --sites-subdir="sub8.localhost" --db-url=mysql://root:root@mariadb/sub8

You are about to create a sites/sub9.localhost/settings.php file and CREATE the 'sub9' database. Do you want to continue? (y/n): y
Starting Drupal installation. This takes a while. Consider using the --notify global option.                                                                                                                                                                                                                                                                            [ok]
Installation complete.  User name: admin  User password: c9ckp3Xp3C                                                                                                                                                                                                                                                                                                     [ok]
Command config-set needs a higher bootstrap level to run - you will need to invoke drush from a more functional Drupal environment to run this command.                                                                                                                                                                                                              [error]
The drush command 'config-set system.site uuid d2a8bd34-90fa-4790-b8a1-840055d0c34e' could not be executed.                                                                                                                                                                                                                                                          [error]
Command config-import needs a higher bootstrap level to run - you will need to invoke drush from a more functional Drupal environment to run this command.                                                                                                                                                                                                           [error]
The drush command 'config-import' could not be executed.                                                                                                                                                                                                                                                                                                             [error]

drush si --config-dir="../config"

bash-4.3# drush si --config-dir="../config" --sites-subdir="sub11.localhost" --db-url=mysql://root:root@mariadb/sub11
You are about to create a sites/sub11.localhost/settings.php file and CREATE the 'sub11' database. Do you want to continue? (y/n): y
Starting Drupal installation. This takes a while. Consider using the --notify global option.                                                                                                                                                                                                                                                                            [ok]
Installation complete.  User name: admin  User password: brHhqM6NZn                                                                                                                                                                                                                                                                                                     [ok]
Do you want to update uuid key in system.site config? (y/n): y
 Collection  Config                           Operation
             responsive_preview.device.large  update
             responsive_preview.device.small  update
Import the listed configuration changes? (y/n): y
Synchronized configuration: update responsive_preview.device.large.                                                                                                                                                                                                                                                                                                     [ok]
Synchronized configuration: update responsive_preview.device.small.                                                                                                                                                                                                                                                                                                     [ok]
Finalizing configuration synchronization.                                                                                                                                                                                                                                                                                                                               [ok]
The configuration was imported successfully.                                                                                                                                                                                                                                                                                                                       [success]
Congratulations, you installed Drupal!