Best way to keep CobaltFlux pads from sliding on carpet?
I have a pair of CobaltFlux pads arranged for doubles, on a custom-built plywood base. During play, the platform keeps gradually sliding on the medium-pile carpet (always away and to the left, for some reason). I tried putting a mat underneath that was made of the same type of rubberized foam as the mats you can buy as cabinet liners, and it reduced the sliding but didn't eliminate it.
I'm thinking the next step is to buy some vinyl runners (with small carpet-gripping spikes) and staple it to the bottom of the platform. Is there a better solution? If not, is there a style of runner that is recommended?