Slipstick CB674 Premium 2 Inch Furniture Risers/Bed Raisers with Steel Reinforced Top (4 Pack) Adds 2" Height, Supports 2,640 Pounds, Stackable with CB671

I have no idea if this would work, but these would be more stable. You could use its foam as templates for the floor foam pads, which seem thicker. Risers/Bed Raisers