I plug mcIntosh mono amplifiers into a transparent power isolator. It doesn’t restrict anything and is designed to remove lots of magnetic Radio frequency noisy stuff along the way. It cost around $6000. Also well insulated power cables are kind of important too. Just spend some money and get a nice box that you can plug your gear into and I think you’ll live more happy.
Plus it offers a hydraulic surge protector which is appealing. The purists don’t like surge protectors but I don’t see the problem and my panel has a surge protector but I don’t wanna take a chance and destroy a very expensive amplifier because of some stupid lightning bolt due to a large tree I own or whatever.