There is a huge, literal gap between professional power quality meters such as by Fluke and audiophile toys. The gap is in the frequency band they cover. The pro’s measure noise and distortion in the range of motor frequencies and the audio band, and the range we care about for power supplies.
The toys they sell audiophiles are usually poorly specified or measuring noise so high in frequency we may never even hear it.
Chasing down a 1 MHz RF signal is a rabbit hole that can send you down spending money you don’t even need to spend.
This is one major reason I like surge and noise filters from Furman wiht SMP and LiFT, as well as the series mode protectors by SurgeX, etc. The series protection starts filtering down at 3 kHz, while many RFI/EMI filters don’t even work below 100 kHz.
My other bit of advice is to separate out noisy wall warts and keep them away from the clean side of your power conditioners.
If you _must_ invest in these power noise ... gizmos, at least find out the range of frequency at which they are working at, so you know what the signals mean.