Yes, they sell a non slip vinyl that is self adhering to the rulers and it is WONDERFUL :D:D:D I have it on all of mine now. I can still move the ruler on the fabric, but when I apply pressure to it, it stays in place much better!!!
Mine is called Invis a Grip, there is enough of it in the package to take care of many rulers. It doesn't have to go completely to the edge, I left it 1/2" in all of the way around the edges.