Brainwave

I just had a bit of a brainwave. On things like coasters and toughened glass cutting boards they have little rubber feet to help prevent sliding. If I attach 4 of these - one to each corner - they will help prevent the board's moving around and save on the cost of magnets. It might even make them more stackable. The more I think about this idea, the more I like it.
I need to save money where I can anyway, as I need to purchase a hand sander to help me with the rivers