Do you have cable or fiber optic internet? If there is one, you may also want to upgrade the ethernet cable going from the modem/fiber optic box to router.
I like to think of the data flow to and from the internet as a river that flows both ways. Because each switch is powered, it will contaminate the data stream with noise from the power source along with internal device generated noise and EMI. I don't know the extent of how much noise the switches contribute since I use wifi but they will at the very least add artifacts from the switching power source. Its often overlooked that all ethernet cables carry power and they will transport power back and forth between devices even if the devices don't need or use it.
Usually, something like that ENO device would probably be most effective when connected at the highest point upstream in the chain but since you have multiple switches it gets tricky. You could theorize and try to account for this and that but its probably easier and alot faster to just test it out with the most reliable scientific method, good ole trial and error.
If you wanted to optimize things, you could try to minimize the number of switches in the chain or upgrade to an "audiophile" switch and use linear power supplies for those switches. I recently got this linear ps from aliexpress to replace my ifi power x and it made a significant difference, not huge but definitely worth the price imo. Also, the use of good shielded ethernet cables will always help. Don't worry too much if a cable is limited to cat6, unless you have multi gig ports on the switches and router, it will be bottlenecked at the max bandwidth of whatever the ports are limited to. Music files are small and a cat6 cable is not going to be a limiting factor. You could also upgrade the wall outlet to an audiophile duplex, I upgraded mine to a Furutech GTX-D and the difference was huge with that one.
Power filtration is one more thing you could do as well but that is a huge money pit, the linear PS will help with the noise generated by AC power oscillation at 50/60hz but won't filter the power unless its a specific feature.
I've to come to understand why the music servers are so good for music. I know the PC is major contamination source but I didn't realize how much it affected sound.
If you do upgrade anything, I'd be interested to hear your observations on the changes.
starting tomorrow, so while obviously miss them, critical listening and mountain biking should see definite uplift! These changes in your chain probably wont lead to night and day differences but could be worthwhile nonetheless. One question are you earthing both switches, as i've found this brings appreciable improvements to both these switches.
I mean my 2nd network switch.
