I coil them up, using a pair of zipties or velcro strips, to keep them as short as possible, and I never let them dangle on the floor. I have zip-tied a power s

I coil them up, using a pair of zipties or velcro strips, to keep them as short as possible, and I never let them dangle on the floor. I have zip-tied a power strip to the metal crossbar connecting the two back legs of my desk so that power cords dropping down the back of the desk need not touch the floor at all.