How to keep CB magnet mount from scratchin paint?

I saw a Cool little trunk mount that came up through the seam between the Trunk lid and the 1/4. I'm not sure how it attached underneath but no holes were drilled where you could see them. I guess the Cable had to pass over the weather strip but that's no big deal. You could also tap right into your AM or FM radio antenna. You would receive just fine but getting out real far is another story. That requires proper SWR Settings and experimenting with different lengths of cable. As stated above pull straight up when removing magnet mounted ant. They like to slide and scratch paint.