Audio Grade Ethernet Cable

Ten feet is probably far enough. Hopefully the wall warts are not plugged in to the same circuit as your audio stuff. I am not completely sure a line conditioner will prevent degradation of sound if they are. 

Stored files should not sound any better than streaming. If same recording, my CD = Stored files = streaming = vinyl. It is worth getting streaming = other since your library goes up to millions of albums for the price of $14 / month.

That will slowly change everything in a really good way. Not just relistinging to the same music but finding hundreds of new and great music. I seldom listen to anything that is in my 4,000 CD / Vinyl collection. And my outlays for music are a flat $14 / month. I’m retired so having all that music is incredibly wonderful. I’m listening to five Cannonball Adderly album’s I never heard before. It’s incredible. 

The opposite - you should get your router as far away as possible from your components. Routers emit noise. 
Ethernet cables make a difference. I’ve tested several and they all sounded different. I tried Supra, Supra with Telegartner connectors, LinkUp from Amazon (very decent by the way), Purist Audio and Audience (mu current cable). 

DH Labs cables are excellent value and they’re a good entry point into higher quality cables. If you want to go cheap get Linkup. 
https://a.co/d/elkT0FX

Then save up and upgrade to something in the $500-$1000 category. 
 

@ghdprentice Yes, I have Qobuz as I stream it at the gym. For whatever reason, I’m getting a lot of noise when I stream. When I play the files from my SSD, it’s very clean with a great soundstage and black background. The modem and router are just Spectrum issue. Do you think I should change out my CAT 8 with a CAT 6? I have both.

If wifi enabled router will leak rfi into closely situated equipment. If you disable wifi it's really no noisier than other digital equipment, hard drives and transformers will leak more rifi than a router with wifi disabled. I have trifield meter so I have measurements to prove it. 

@audphile1 I greatly appreciate your input and I'll look into those cables you mentioned.I never knew that some ethernet cables cost as much as $30,000.00!