Is there any chance the buzzing is actually from what you have the PSU plugged into? I think ive had a surge protector that have a buzzing without anything drawing power that went away once something was consuming power.

In this particular case, OP said none of the others met their needs. I would like to know what new functionality this one has to know if it’s something I’m interested in or not. It’s not a critique - it’s helping me understand if I want to check it out or not.