My favorite (free) cable lifters are some of those old porcelain coffee mugs that multiply in your cupboards from friends, relatives, and branded companies.
I put them upside down on the carpet and lay the cables on the 'top'. Maybe a little tape to keep them in place, or just careful positioning of the cups so they closely follow the drape of the cables. With enough choice of cups, I think they can look pretty good too
As one who has had some experience with visualization of electrostatic fields, and has full carpeting, I am quite comfortable with simple measures to keep my speaker cable suspended quietly in space, regardless of nay-sayers !
Dave