Popcorn anyone?
Munch munch munch.
Quite, this is all so predictably and repetitively pointless. Not the question, but the answers.
You either believe cables and mains blocks work, or you don't. I absolutely believe they do, both of them. If you don't, I can live with that. The best answer, if you want to give it a try, is to look for said items second hand, so you can sell them if they don't float your boat. Secondly, borrow from a dealer, but I feel bound to buy from them, at full retail, if you wish to go ahead.
I used the Kemp power block for a few years, now a Pure Power APS regenerator. To my ears, both made an obvious, immediately audible difference