Write Synergistic Research on it in crayon, charge $600 for it and whole-heartedly recommend at least 3 for best results, and the cable sniffers will follow you to the ends of the earth.
Affordable Grounding
My Frankenstereo has assorted grounding elements behind the rack. The head end of the streaming chain is in another room. At the wall outlet, there’s Nordost QBase 4 Mk II – with a ground lug.
I tried this inexpensive grounding tweak clipped on to the lug. Subtle – but it works. More transparency. Probably similar results with the Puritan Ground Master – and other brands. Worth a try! Certainly more affordable than an Entreq. I purchased the cheapest one with the copper wire/paper cylinder. (Not a fan of silver-plated wire.)
YMMV