I hooked up my camera and it does require a hole or two. That being said if your camera is wireless just a few screw holes will do. If it is hard wired to a monitor in your tv then at least one hole about a half inch in diameter will be needed. I had the same reservations about drilling but got over it. On a side note I love having the camera. I towed my rig to my dealer about five miles from home and didn't plug it in, and felt naked without it. Drill the holes. Any questions pm me or ask on the forum. There are a lot of helpful people here.
Peace
Dave