For the rear camera, clean the back windshield area where you plan to mount it. Attach the rear camera in the same way as the main unit.
Same as the front camera, you’ll want to check the live-view of the rear camera before mounting, making sure it’s up and running, and using the positioning lines accordingly.You’ll want to specifically make sure that there aren’t any heat strip lines blocking the dash cam’s vision.
As for adjusting the angle of the lens, the U3000 is a little different from other units, namely because of its coin-slot on the side of the unit. Putting a coin, or other similarly shaped objects in the slot and turning will turn the rear camera lens as well, as opposed to other models that would have you manually turning the lens. Trying to turn the lens physically is possible, but will require some proper physical force, and is not recommended.
As you might’ve noticed, the design for the rear camera is definitely a bit longer than other models, which is mainly due to the radar module built into it, the first rear unit to have a radar sensor built-in.