I can only talk for my own experience and Entreq. It does work and added a new level in my system. I’d recommend borrow these things from your retailer and let your ears decide.
I have the following setup with great result.
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Entreq wraps and Eartha Apollo grounded to a ground box around the Burndy between 555PSDR and 272 and another on the power cable going to my power strip.
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Entreq Konstantin Ethernet cable to an Olympus Ten ground box. This has by far outperformed BJC, Chord, Shunyata Venom and other ethernet cables in my system.
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Entreq Poseidon + Eartha Atlantis to my Lumin U1 Mini ground connector which also ground the BNC shield going to my 272.
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Entreq Poseidon + Eartha Apollo to the ground pin on my AAphono which is connected to signal ground too.
My Tannoy speakers also have a 5th ground connector so I will try grounding them too. This ground the speaker housing and according to Tannoy increase performance even more.
Also just decided to keep a Furutech NCF Clear line plug that sticks into my power strip. Great product.