Exactly, that’s what’s strange to me. I understand the decoupling concept is to prevent microphonic vibrations from reaching the equipment, but it seems (to me) the benefit is largely negated if the cable is then laid on the floor post decoupling. If the purpose is actually to prevent vibration from reaching the socket and this is of greater importance than the vibrations that reach the equipment, then both Powerline and Lite make sense.
I basically did what you suggest i.e. assumed Naim know what they are doing and I’m not making any statements about the effectiveness of the product, just that my understanding of it is incomplete. Maybe I will ask the question in a separate thread.