1 in Puritan 156 and 1 in HFC MC-6 Signature 3D
The one in Puritan156 has greater result since my Jeff Rowland amp and Lumin streamer connect into. Along with my series of MC-05s and MC-1s magnets
Re: HF MC-0.5's. I experimented with placement, eventually following Rick Schultz's recommendation to start at the wall. I have two dedicated lines, there are 2 MC-0.5s in each duplex and one more in a power strip with amp and preamp. There is so much sonic improvement. Plugging a MC-0.5 in my EquiCore + DeepCore yielded very little effect. Possibly because the HF's need to condition the mains.
Whatever technology the Puron uses, it seems like it will work anywhere in a system. I'm expecting a demo unit from Mark since the Purons are sold out. Maybe you bought the last one.