HAVE INSTALLED 4 IN LINCOLN LS THEY WORK GREAT!
Best routing requires removal of the rear seat cushion (rear easy: Two releases at front of seat, push a small pin into right rear shoulder belt to release). Remove right (passenger side) of trunk liner, and the trunk lid liner. The wiring is the weird part. The LS backup bulbs power up backwards and are module controlled.
Remove half of the wiring protector conduit on the right trunk lid hinge arm.
Remove electrical tape from the conduit that goes up to the trunk hinge arm R-side.
Run RCA video cable and power wire though the hinge arm plastic conduit down though the conduit on right hand trunk side. Ground the negative wire to car body or trunk lid. Run a wire from the (-) negative turn on side of the backup lamps along side the camera power wire.
Remember the rear electrical module REM grounds the backup lamps to turn them on so you will have to install a power reversing relay under the center console. One side of the relay coil is connected to the Radio touch screen reverse trigger wire and the other is powered by accessory or battery saver circuit.
Route wires from the trunk under the right rear seat hinge area next to factory harness, under the floor insulation under the rear seat and through the short section of carpet (lift up to make easy) to the console. There you have a direct shot to the radio display on the dash. Good place to mount the reversing relay.
Get the camera from Ecomaster (model VM-301) it mounts in the surround above the license plate (most effective place and angle). Don't use one of those cheesy junk kits with a display with radio controlled cameras that bolt to the license plate.