The one I use most doesn't scoot on the carpet, but I saw a suggestion somewhere that nobody has mentioned so far, so I thought I would. If your table is up against a wall, you can lay a board between the pedal and the wall to give the pedal something to push against. It's a matter of finding a board or piece of plywood that is the right width.
Another one would be to put a few thick lines of silicone bathtub sealer on the bottom of the pedal. Do this when you won't be needing the machine for awhile because it may need a full day to dry. Read the label on the product because they might vary.