I read your article and immediately remembered having the same problem with slipping. Not on my dash mount but on the top of my bar. I went to WalMart and purchased non-slip shelf liner. It is rubber, more or less diamond knitted, but there are many other types, and it worked perfectly. Absolutely no slipping. I just purchased the same dash mount as you are reviewing here and I appreciate this heads up. I like the idea of using this liner because it does not have to be tacked down. Just cut a proper sized and dimensioned sheet of the liner on the dash and then set the dash mount on top of that. That is what I am going to do. I am sure it will work. Good luck.