Is my system (practically) RFI-proof?

Yes, HFI/RFI noise entering components and especially cabling, also affecting the whole room is a main issue at least in highly performing setups. It strongly but not only affects 3D holographic palpable imaging, air between instruments etc. Your setup will be transformed in this regard if you take measures.

No filter, no regenerator will help this, as those units are affected by it themselves and after their point of delivery of filtered or regenerated power, the whole chain will be immediately affected by HFI/RFI again. Cabling being only one big part of it, acting as antennas.

A fascinating observation is, how you can influence the spreading/shrinking/positioning of a soundstage with room noise cancelling devices.

This is a link if you’re interested in solutions. I’m not deep into the technology but I know it works and is essential especially in top setups.