ETHERNET CABLES

@samgar2 

Sam, the only way to find out if the extender above your floor will work or not is by relocating the VFios near Zenith. And run the existing 35ft back to your TV from VFios. To me, the shorter high quality ethernet cable + filter should yield a better improvement than a shorter run to your TV from VFios. All of this ofcourse contingent upon if your extender near computer remains effective. 

@samgar2 

What is a mesh network is and how is it set up. 

Perhaps the younger cousin of a mesh network is a wifi extender. That was my plan to do this, as I was not able to run ethernet to my system. After research, I bought a TP-link WiFi Range Extender AC2600 RE650. This has an ethernet out, so I could easily connect to my streamer.

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.

I still use the extender in a bedroom, with a second system.

@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.