I had an Alpine iLX-511 installed (11" screen; Apple Car Play) and I am very pleased. I asked the installer to look for an opportunity to connect to the (8 speaker) Home Theatre that is factory installed. They were unable to connect the Alpine unit to the home theatre. I did have newer front door and dash speakers installer, so the result is very nice.
The 22" TV that was factory supplies has an unusual module that allows it to be connected to the home theatre speakers (from the shelf to the right of the clothes cabinet).