Hi @yoramguy1, Lots of ideas huh? I installed the Eero Mesh Pro 6 Wireless Router system in my home about a year ago. Simple and powerful wifi. Three in my kit for my home. One needs hardwired to router, the others can be or not.
Also, Auralic Streamers are known for their wifi reception and some say wifi on an Auralic is better than wired. I use my Aries G2.1 wired, but it sets up with wifi.
I run two other wireless Roon endpoints in MBR and MBath and they work fine.
I have not upgraded my modem in years (Verizon Fios). Good luck!