I use tube shaped styrofoam pipe insulation found at home depot for a couple of dollars and cut off what I need. Cheap and effective. You can wrap your cables in them and/or cut off enough to make a base to lift the cables off the floor as much as you want. Great for Power cords and speaker cables.
Better to use paper cups than styrofoam. The paper is totally non-conducting (depending on whatever coating may be on it) whereas the styrofoam is a plastic so your reintroducing yet another dialectric in contact with your cables. .
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