I got the rear view mirror mount. Keeps monitor out of way and where you would normally look anyway. Tucked wire up into headliner where it meets top of windshield. Remainder of wire stays tucked in weatherstrip on A-post, down to glove compartment area, where I swing it across to 12v oulet. When I'm not towing, I just unplug from 12v cord near top of A-post and take it down from mirror.
BTW, it's an observation cam, not a backup cam. Two different animals with big differences.
2019 Rockwood Geo Pro G19FD w/off road package
2015 Ford F150 XLT Super Cab 4x4 V8