Outlaw is thumbs up for daisy chaining 3 units. No more. Requires a Mono 1/8' plug IIRC.
I use the Music Sense feature and am fine with the ~3 second lag as the signal works its way through the chain.
I have all five plugged into their own 20 amp power strip. All equipment in my room is on the same 20 amp circuit (and AVR, TV, PS4, BD player are on a different strip).
Even Godzilla 3 at Reference Level didn't trip anything, and there is that scene during the battle with what seemed like a minute long infrasonic climax... I was reaching for the remote, but nothing happened. (Well... other than the foundation settling slightly, and maybe a few nails getting loosened, but who's counting?)