Thanks. Unfortunately I was not able to simply accept the MirrorLink connection. I had to choose the connection from the menu of the car radio like LG Drivelink, Sygic or Glympse.
MirrorLink is a part of Android 7 you are right. On S8 this section shows you the MirrorLink compatible apps on your phone. The apps here must have VALID up-to-date certificate as well so you cannot modify the apk for you needs.
Anyway this project was dropped by me because of the useless car-phone connection even Android Auto on my friend's car. In Android Auto you can use only Google Maps and Waze nothing else due to compatibility reason. I'm using my tablet via holder.