I went with RV Cams, but as for the monitor ... My 7" monitor came with a puck mount (1 screw) that I mounted to a metal brace under the headliner between my sun visors. I dropped my dome light assy down and tapped power from it running a fused wire to the monitor. Nothing shows, no messing with a dash mount, and is easy to glance up between the sun visors.
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