My backup camera screen is actually in the rear view mirror. There is nothing but a small, monochrome display in the dash, and that just shows the radio station, time and AC temp setting.
Sorry for the Amazon link, but I haven't had enough coffee to Google better: https://www.amazon.com/AUTO-VOX-T2-Monitor-Waterproof-Revers...
The videos in the reviews do a better job than the actual product videos of showing what is going on.
I feel that a good backup camera system gives you a better view of a wider area than just using the standard rearview mirror or than turning around and looking out the back of the car.