I buy those place-mats that look like non-slip shelf liners. Three for $1.00 at the Dollar store.
I also use them under my computer keyboard.
I have lace cloths on my end-tables that were always moving(cloths, not tables). I cut some white ones to fit under the lace. Worked great.
Works good on the floor under foot pedals, too.
Also works for under my piece of Corian, (from a garage sale) that I use to cut the backs off my books that I bind. Keeps everything right where I want it.
Joyce