Speaker cable lifters.

Tried them and they only made it easier to dust the floor. They look neat but I am on a concrete slab with wood floors, did nothing for sound. But hey they may work for you. In comparison to other suggestions (fuses and the like) Tinker Toys, Lincoln Logs and wood blocks are cheap.  

The concept of cable "lifters" has an interesting history. They were apparently first proposed by Enid Lumley, a reviewer for TAS. This link adds a little more to the story:

https://positive-feedback.com/audio-discourse/bunking-cable-lifters/

It's a relatively inexpensive tweak to try. If you hear a difference in your system, in your room, with your ears, then that's all that really matters.

The OP has a high level system in what looks to be a challenging space.

Are room acoustics- damping/diffusion fully addressed? The ceiling/speaker arraignment has to be affecting overall SQ?

Leaning forward and eye squinting will probably have the same effect as cable lifters. Naturally-YMMV.

Expanding on wolfies comment- the entire room floor needs to be on a Minus K isolation platform for "true" vibration elimination.

@tablejockey Yes. This room has always been a challenge to work with. This is the only room in my home that I can possibly have a dedicated audio room. This room is far from a perfect audio room. But at least I do have a dedicated room. I just have to make the best of what I can possibly do with it. I have not really addressed all the damping / diffuser areas in room. But I did just by a new 2 in solid tiger maple rack and 3 in sold maple amp platforms from Timbernation. About my floor. It is a solid oak wood floor with area rugs laid out. W/ plants behind speakers on corner of walls. Soundproof thick drape for my downstairs door with window panels. I really would like to call up a professional to come to look at my room and see what I really need for wall and ceiling diffusers / dampers. Also I do have a few canvas framed painting on my walls to also help with sound dampening.

I’d tried ceramic, wood, laser printed, popsicle sticks, etc. On tile or wood flooring, raising my cables mainly keep dust bunnies from clinging and very little else. On carpeted floor, I do hear a difference especially during dry winters. I found them most effective with non-shielded cables, speaker and interconnect cables alike. If one takes the extra effort to use cable risers, he/she will mostly make the extra effort to dress their cables properly. Such as separating power, interconnects, and speaker cables from each other. Usually an inch or so will do. Should cables touch,try one’s best to cross signal and power cables at reasonable angle. More perpendicular the better. I humbly believe cable dressing pays the biggest dividend. 

Finally, I came across and currently using a few Rebar Chairs in parts of my cable web. Cheap and effective. Many styles and heights to choose. One with perfect slot to slip in my Analysis Plus speaker cable yet able to hold a two inch diameter power cable with slight modification.

Hope you find this useful.