How to keep CB magnet mount from scratchin paint?

Thanks to all of you - it is so cool that you all engaged - all were excellent thoughts, good ideas - and sound data ... I actually learned - better said, I was reminded, of the nature of 'connection' to the car. Finally, I am afraid the most recent experienced comment from Dave is the unwelcome truth ... to attach it and leave it - there is a cost in damage to the paint ... pretty much no matter what ... .
No matter, I enjoyed all of your input. Thanks!