the real story is how much of that noise is from your own house. and fixing your noise issues are most times much, much cheaper than buying an audiophile power conditioner and trying to treat the problems your house is creating.
fix what can be fixed in your power grid, and then you can go from there. but find out what is what about your situation.
a local friend of mine, Rex Hungerford, is a professional electrician and high fidelity home electrical consultant who travels around helping audiophiles optimize their home power. no magical theories or mumbo jumbo, just the facts. he has all the tools, and actually knows how to use them.
you can call him for advice.
https://www.kingrexelectric.com/about
he is the guy who fixed Michael Fremer’s home power grid.
https://www.stereophile.com/content/analog-corner-315-electrical