All you are going to need for this project, is a piece of non-slip outdoor rug & mat pad. You can find these at Lowes.com. You only need a small square of it, so find the smallest roll you can.
My square was about 6’’ x 6’’
I simply folded it in half a free-cut out a heart shape.
You can cut out any shape you like, I choose a heart simply because it was easy to cut out. = )
And there you have it! All that is left, is to test it out! Put it under your ruler to hold it in place like the pictures below.