I have a larger screen for my backup camera, that I velcroed to the top of the driver's sunvisor. When I want to look at the camera, all I have to do is flip the visor down, and it doesn't take up any dash space that way. I have it wired to two cameras that I can select between, one at bumper level that looks straight out behind me, and another at the top edge of my camper top that looks straight down on my hitch and makes single-person hitching much easier.
I am tall and almost never use my sunvisor to block the sun, so the screen isn't in my way. Other folks that use their visor a lot may not like this arrangement as well.