ETHERNET CABLES

@samgar2 Verizon Fios routers are crap. The range is extremely poor. I never tried their extenders but I can tell you based on your description of your current setup, something like Amazon EERO would be a game changer and not just for streaming. 
I’m using the 3 EERO setup and have one EERO access point right by my system in the basement. The main router (Optimum) is upstairs with a gateway EERO wired to it. I get between 225-325mbps out of the basement EERO access point. That is more than enough. 
There are other options like Google, tp-link, etc. Pick one.
Then you would only need 1-1.5m length ethernet cable for your stereo system which reduces your streaming ethernet cable cost and opens up better cable choices.

@jerrybj 

Then I found out that you can use a phone cable for ethernet, so got my electrician to change the plugs. That was a problem solved.

Wait, what?! Please explain.

Extended the house in 2009, and had a telephone line put through to the lounge. Most probably Cat 5 cable. Phone is no longer...

Was easy for the electrician change the wall outlet from phone to ethernet cable.

@jerrybj 

Thanks for clarifying. Glad to hear it wasn't old 4-cond phone cable from 40 years ago.

@painter24

I've used a similar kit by TP Link between my router feed and Node N130.

The best improvement I achieved with my Node 130 was to replace the AC power board with a DC power board and a 5v iFi audio iPower X Low Noise Power Supply.
 

Bluesound Node 2021 (gen.3) upgrade – low noise PSU interface