Ethet net to fiber optic to feed your streamer

I have exactly your mesh system but my audio connections are hardwired to my base router unit.  I do also have a secondary system with the streamer hardwired to one of the router mesh satellites.

Small Green Computer (link) can economically set you up for fiber isolation, starting with their switch that has a fiber output and then, at your streamer/dAC end, their opticalModule deluxe with their 7V linear power supply.  If you wish, you can add a 5V LPS to the switch.  I use all of those and have had very good luck with SGC for my digital audio needs.

I use the ADOT ONI 100 (Optical Network Isolator). These are designed and manufactured by the Melco/Dela distributor in the UK. Elegant and simple - ethernet cable from your router / ethernet output to your system or your audio network switch for your audio system. Have a good look at the KECES eWave network switch. These two items together solve so many issues for your system.

@mitch2 

How would you describe the sound quality difference between the hardwired vs mesh (wifi)?

@brighamdoc you can also speak to Luis at Sensis Audio https://sensisaudio.com. It’s more of a turnkey service where he integrates carefully chosen components to create a EMI noise moat for your specific setup.
 

I used Ethernet to SFP to Ethernet with my Esoteric N01XDSE, and since then simplified to Ethernet to SFP Optical to SFP Copper with my Esoteric N1. Very happy with results, benefits of noise reduction aside there is an unexplainable improvement in the lower registers. 
 

PS - I came from an EtherRegen and it’s no contest

@brighamdoc I am a happy owner of a Sonore opticalRendu Deluxe. It replaced the older opticalRendu, and years before that a microRendu. IMHE, the latest model provided more sonic improvement than I expected.

On the network side I previously used a TP-link simple ethernet>>optical converter which was bettered by a Sonore opticalModule. I replaced my cheap Trendnet switch recommended by SGC with a newer model that had optical output. That allowed me to eliminate ethernet cable entirely, along with eliminating the opticalModule. That change put money in my pocket and didn't noticeably impact SQ (YMMV). In all these cases, I run 5m optical cable into the listening room and keep the router, server, switch etc. in the next room...since long run optical cable doesn't degrade SQ, it's wonderful being able to separate the potentially noise gear from the analog components!

The last planned piece of the puzzle for me...the not yet released Uptone EtherRegen2 with B-side optical going to the opticalRendu Deluxe which I user as a Roon endpoint and HQ Player network audio adapter. 

I suggest you spend some time reading audiophilestyle, FKA computeraudiophile. The designers and many super knowledgeable users frequent the space. Cheers,

Spencer