Cable droop

Power amps are usually placed at the bottom of the equipment rack.
Floor standing speakers, have their binding post at the bottom.
What droop?
If you have such a problem, on the Amp side, you may place a plate (Aluminum or wood), drill a hole at the edge (Prominent from back adje) 
and connect a short rope around the cable and that hole.
I use #0 AWG cables and they are ok.
A 3 m long #0 AWG weights 1.85 kg. and on each channel there are two.
The cable is flexible and the partial weight is not an issue.

For years I have used “cable stackers”, dirt cheap from your local electrical supplier. These are easily suspended with monofilament fishing leader (doesn’t stretch to the degree of regular mono) from the wall, rack or anything available. Also particularly useful if cables are run underneath floor joists and suspended with mono.
The short ends of the stackers can be heated with a heat gun and self glued together to form a descent cable riser. They are available in black, red, and white. Also low dielectric. 

I bought bamboo cut it to length used twine to weave 3 pieces together into a cable holder efficient, nice looking,cheap fix 

Of all the droops I have to contend with this is the least worrisome.

I have always hated my cables laying on the floor, but now that my living room has been freshly painted, I have a Solid Steel double wide rack and have a new set of speakers arriving tomorrow I'm going to go through my wood pile, sharpen my jointer blades, break out my set of dado blades, fire up the the table saw and make some cable elevators. What color finish sounds best?