Network Switches

@rivinyl along the lines of what was recommended by @lalitk

here’s a cheaper option for lan optical isolator 

https://www.musicdirect.com/equipment/accessories/ifi-lan-ipurifier-pro/

comes with Music Direct return policy. 
you would place this device to feed the final Ethernet entry point - if you’re using the electrocompaniet as a streamer the iFi device would be placed immediately in front of the electrocimpaniet ethernet connection  

As to linear power supplies - my thought process is if your Trendnet switch is not plugged into to same circuit as your audio system, adding LPS to it is unlikely to make any difference. I would add LPS to the SGC and add good Ethernet cables throughout with the best one feeding your streamer. 

Thanks for all the suggestions.!

Im using a LHY SW-6.  Works great.    Using the fiber port to a media converter then to Aurender N200

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.

The review on the Stack Audio Smooth LAN Regenerator used the Smooth LAN near the streamer and an Uptone Audio Ether Regen close to the modem. Seems like since the Smooth LAN is a re-clocker and passive filter, that would be enough.