Ethernet

Hello @maprik !  I use and recommend this LinkUp Cat 8 22AWG:

https://www.amazon.com/dp/B087C9VZHT?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_3&th=1

It is much better than cheapo  cable and won't break the bank.  I have it on two runs of 25 and 30 feet.  Also, don't use cheap connectors or wall plates.   I run the cable through the wall (plate) and make direct connections if possible.  If you need a junction use these from JCAT:

https://jcat.eu/product/net-isolator-gigabit-network-isolator/

I find these difference's matter.  HAPPY NEW YEAR!

Yes, bypassing the Wi-Fi receiver often yields benefits because you’re bypassing its processing and any noise it generates.  If I was you I’d get an Eero Mesh setup and run a better/shorter Ethernet cable from that to your streamer — being able to use a better Ethernet cable can yield big benefits as opposed to using a cheaper/longer one.  Just my $0.02 FWIW. 

Honestly modern Wifi is really good, the biggest issues I know of are related to contention on the same Wifi channels and RFI noise. 

I always suggest users get a free phone or laptop Wifi analyzer to help them see their Wifi neighborhood.  Pick an unused channel and park your router there. 

@maprik ​@soix 

For what it’s worth, I am not an expert, but, I agree with soix.  Unfortunately, you have to be willing to spend more money.  There are 5 things you can do, I believe each will give you benefit.

1.  eero mesh nodes
2.  5 volt Linear power supply to the eero mesh node connected to your streamer
3.  Audiophile quality ethernet cable from your eero mesh node to your streamer
4.  Ethernet filter between the eero mesh node and your streamer.  I use the stack audio smoothlan filter
5.  If the internet coming into your house is not fiber optic, but, older Copper cables (ie. DSL), then, you can do a copper to optical conversion from your router to your first eero mesh node to get rid of the noise coming into your house on the copper lines

Here are a couple of pics. 

copper to optical conversion and back again.

eero mesh to hard wire ethernet to stack smoothlan filter with LPS power supply

Fully agree with the concept but premium ethernet cable of that length like DH Labs Reunion Cat 8might be pricy (close to $500).  You might want to consider much affordable fiber ethernet combo that might render equally good result.