An interesting thought. I realized that I run my network switch through my power conditioner ( a Digi Buss ). The maker of which commented that that should be "cleaning' the power. So perhaps an iFi X power supply would not add much to the mix. I wonder whether an optical isolator would be beneficial in that setting.
@rivinyl , FWIW, I tried the iFi LAN iPurifierPro between my switch and my integrated DAC/streamer/amp and vacillated between thinking it made no difference and thinking it slightly degraded sound quality. I returned it and went with the pair of media converters and SFPs (described above). That approach in my system has resulted in a decidedly lower sound floor with no (at least as fast as I can hear) accompanying loss of dynamics or other degradation to SQ; it also saved ~$200.