I installed an after market stereo with two camera inputs. One input is for my TV, the other for my TT. The screen is about 7”.
I installed two cameras; one on my TV and one on the back of my TT. They’re hardwired. The cameras were about $20 each on Amazon. The Pioneer stereo was about $500 and has built-in Apple Car Play and Android Auto.
It’s nice having my texts, maps, Pandora, etc. on the stereo when using Apple Car Play. I also like that I don’t have to have a separate screen for my cameras. Everything is in one unit. The cameras work great and I haven’t had any problems with this setup.
CameraPioneer Stereo