OK, you want non-slip products.
Sandpaper dots available at Joann's & Michaels [sometimes] and LQS's. Remember to place them nonsymmetricly
Invisigrip is also available at Joann's and LQS's.
True Cut TrueGrips.
Make your own dots with rubber cement, making sure to let them dry before using.
Hope this helps. I expect there are several more choices.
ali