-regenerators add distortion to the line. basically an amp for your amp. limited to what that amp can output. They are also current limiting, if that's actually a thing.
-isolators add inductance to the power factor.
-caps add capacitive loading also effecting power factor.
-your outlet-wire-breaker is current limiting as well.
nothing perfect. probably best to have a dedicated line run from your panel.
oh your equipment has many of these already in them as well.
no one talks about protection though that is more important to me.