OK, Update for those interested or who might have a similar issue in their AC line.
I got a pair of AVA Humdingers. They have two receptacles in them so I tried one to begin with.
I was not sure if they would get hot, or stressed with both the Kismets plugged in.
The one is running cool and I have been running music and video for a couple days so no worries there.
So far so good after two days...............
Will let you know if that changes, but usually I would hear an episode of DC hum even if just for a little bit every day or every other day.
And if you were wondering- no impact on sound.