Wow, those drop down units sure have gotten much cheaper and far more capable. I added one (with VCR) to a van back around 2000 and it cost 3-4 times as much. To install, I just cut a hole in the headliner, put a thin piece of wood above the headliner to screw the unit to, added foam rubber so nothing rattled and it all looked very professional. Yours should be even easier to install because everything seems to be in one single unit while mine had a separate VCR that had to be mounted elsewhere. The drop down monitor lasted the entire 198,000 miles I owned that van but the separate VCR didn't do so well and was replaced a couple times, eventually by a portable DVD player.
2017 Gas Pacifica Limited, Vel Red/Black/Alloy
Tow, Vac, Adv SafetyTec, UConnect Theater, 18" Wheels