You use the Ethernet out of the router and then feed your network through the switch. If you go through the reviews, you will find interestingly going with a linear power supply did NOT improve the sound on these switches! Which is very interesting. Not sure about router but as they are similar in some ways that maybe the case. Maybe an IFI low noise switching PSU would do the trick as well.
EDIT: Realized you also use WiFi for your stuff, so a switch doesn’t solve all problems. Curious how iFi PSU compared to Sbooster, to me it’s overkill.