After market rear view cameras/monitors

Don’t know anything about the mirror ones but I just can’t get used to just looking at the monitor myself. I go back and forth looking at the mirror, monitor, and turning around. Maybe someday but its been a couple years and still not used to it. I was thinking about it for my other car since I can’t see where the trailer is to back it up. But I don’t like the idea of a monitor sitting there either. On my other car, the monitor is incorporated into the navigation system.