<field id="Moduleposition" translate="Module" type="multiselect" sortOrder="30" showInDefault="1" showInWebsite="1" showInStore="1">
    <Module>Module Position</Module>
    <source_model>VendorModuleModelConfigSourceConfigOption</source_model>
</field>

<?php

namespace VendorModuleModelConfigSource;

class ConfigOption implements MagentoFrameworkOptionArrayInterface
{
    public function toOptionArray()
    {
        return [
            ['value' => '1', 'Label' => __('Top Right')],
            ['value' => '2', 'Label' => __('Top Left')],
            ['value' => '3', 'Label' => __('Middle Right')],
            ['value' => '4', 'Label' => __('Middle')],
            ['value' => '5', 'Label' => __('Middle Left')],
            ['value' => '6', 'Label' => __('Bottom Right')],
            ['value' => '7', 'Label' => __('Bottom Left')]
        ];
    }
}