"Best" cable elevators?

I am currently using folded pieces of corrugated cardboard to elevate my speaker cables and power cords. In my system, they seem to restore intertransient silence (i.e. the carpet sounds like it was blurring the sound of my system).

Anyone know how much difference I could expect by upgrading to terra cotta pots or the wooden dowel teepees?

Also, what is the minimal and "best" distance from the floor that others have found?

Thanks in advance!