If I was going to spend the money, I would seek out Electricians that specialize in audiophile installations, or high end computer installations, Micheal Fremmer has a You Tube on his rewire...
New electrical wiring specifications
I have installed a new electrical panel and am going to run 3 dedicated circuits to my audio wall. (40 feet). 2 monoblocks and other components Would like recommendations as to specifications for the electrician as to wire size and type, grounding, receptacles , etc etc etc. thanks