I've found that power issues can be very localized.
Personally I've never found issues where I live. My last place was a 50 year old house with a rat's nest of over stressed wiring and fuses, yet a PS Audio PowerPlant made very little difference. But the power at Steve Deckert's place (Decware) was very noticably improved after local small/old factories closed down after 2nd shift. My current digs has nearly ideal power. We have our own transformer with underground service, all new appliances, all 12 gauge/20 amp or bigger circuits. The audio system has 3 dedicated circuits, each with a single cryo'd hospital grade 20 amp duplex convenience receptacle in plastic boxes with a combined use grounding rod. I even tried going with a battery amp and DAC (made no noticeable difference).
And I've not heard any advantage to lifting/separating cables, using footers under components, or adding weights (except for an Oppo universal disc player).