In my X6 I have the rear entertainment. It is good and effective but as @TurboLlew has set they become quite dated. What I did on my discovery was go to a place called sound louder and they installed screens in the rear.
These screens look oem in the back, they were wireless headphone friendly, had dvd and USB capability as well as 4G so could stream when needed back in the screens android system. Very neatly installed and the screens have the vehicle oem badge on start up. Was around 10k for two screens but really worked well.
Its your call however, my son is still fine with Dvds in the rear of the X6 but he notices the headphone cable often. The new X3 maybe wireless however my X6 is old a 2016.
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