Best configuration for Puron Plug-in Filters?

I’m interested in hearing from owners of Puron Plug-ins where they ultimately placed their filters for best performance? For now, I have 2 in quad receptacle feeding power conditioner & 2 more in first receptacle of SR Powercell 8SE.


There are other Puron threads where members have discussed this so you might get quicker insights checking there. The 2 I have are in the wall outlets of each of my systems.  Found the impact better there than in the respective power conditioners