I think too, it depends on the incoming power. I've got 4 dedicated lines. Same phase. One for PC & accessories.
Although I can and have gone right into the wall, I prefer the use of a passive filtering device so far. I've found too, the better, the better in that regard.... and not always is just any PLC the right one for everyone or every application.
I've tried Shunyata, PSA, Monster, and RSA. the RSA Haley does best with power train stuff IMO. The PSA Duet seems best suited to front end digital in my case.
If I could afford 2 haley's, I'd likely be doing that.
I've not tried active or balanced conditioning units as I've heard still more varied opinions coming from those camps... or that's my take on them so far.