@curiousjim I have a complicated set up as well. I have about 30’ from my home router and modem to a switch in my entertainment system. From there six devices get network access. For the best audio performance I should put the isolator right before the streamer, but because I’m concerned about an electromagnetically induced surge damaging any of the six pieces of gear I put it before the switch.
It turns out that inside a building isolators are better surge protectors than grounding devices, and the longer a cable run is the more likely it is to have a damaging voltage induced from a nearby lightning strike.