begin{filecontents}{jobname.bib}
      @online{musk,
        author       = {Elon Musk},
        title        = {Tesla Model X},
        url          = {https://www.tesla.com/modelx?redirect=no},
        date         = {2017-07-04},
        organization = {Tesla},
        urldate      = {2018-10-16},
      },

 @online{b,
    title        = {Tesla Model X},
    url          = {https://www.tesla.com/modelx?redirect=no},
    date         = {2017-07-04},
    organization = {ABZ},
    urldate      = {2018-10-16},
},

 @online{a,
    title        = {Tesla Model X},
    url          = {https://www.tesla.com/modelx?redirect=no},
    date         = {2017-07-04},
    organization = {ZBA},
    urldate      = {2018-10-16},
},
end{filecontents}

documentclass{article}
usepackage[style=authortitle]{biblatex}
addbibresource{jobname.bib}
DeclareListFormat{organization}{%
  usebibmacro{list:delim}{#1}%
  mkbibemph{#1}isdot
  usebibmacro{list:andothers}}

DeclareBibliographyDriver{online}{%
  usebibmacro{bibindex}%
  usebibmacro{begentry}%
  usebibmacro{author/editor+others/translator+others}%
  setunit{printdelim{nametitledelim}}newblock
  printlist{organization}%
  newunitnewblock
  usebibmacro{title}%
  newunit
  printlist{language}%
  newunitnewblock
  usebibmacro{byauthor}%
  newunitnewblock
  usebibmacro{byeditor+others}%
  newunitnewblock
  printfield{version}%
  newunit
  printfield{note}%
  newunitnewblock
  usebibmacro{date}%
  newunitnewblock
  iftoggle{bbx:eprint}
    {usebibmacro{eprint}}
    {}%
  newunitnewblock
  usebibmacro{url+urldate}%
  newunitnewblock
  usebibmacro{addendum+pubstate}%
  setunit{bibpagerefpunct}newblock
  usebibmacro{pageref}%
  newunitnewblock
  iftoggle{bbx:related}
    {usebibmacro{related:init}%
     usebibmacro{related}}
    {}%
  usebibmacro{finentry}}

begin{document}
Let's cite! footcite{musk} footcite{a} footcite{b}
printbibliography
end{document}