brickhouse
Cathlete
I would only use 1 pair. I think 2 would make it slide more. The "feet" bumpers on the step and risers sit on top of the foam pad and will take awhile to make their impressions into the foam. If you have 2 stacked together or in between 2 risers it might slide. But that's just my opionion from trying it on the high step, not the full step for 2.
Jeanette
Jeanette