Or, go the cheap route. If your window is like a Gen1, you can unscrew the snaps for the rear window. You can cut a piece of plywood, paint it black, and screw it into the rear window snap locations. You can mount a camera to the plywood. It's easy to get on and off, with about $2 invested. I use this for my DE events on road courses. Works like a champ, with no camera vibration. The center point on the camera is perfectly down the middle of the car, just above the hood.