I have one as well, but I _really_ didn't wait to drill holes in the car. So I mounted mine right next to the top-center brake light, inside the hatch. The wiring was simple, run the wire behind the hatch interior panel, follow the brake light wires down through the rubber grommet into the main body of the car. Be careful when removing and replacing the grommet, as you can strip the little plastic clips that hold it in place and then it won't stay in place and water will get inside your car!

The view from where I placed the camera probably isn't as wide as the guys that have them beside the license plate, but its leaps and bounds better than what you get from the rear view mirror.