Thanks for posting the article.
I would check out Amazon for mesh system, you need atleast two pods. One act as a router directly hardwired into your Verizon router and other pod as satellite which is going to sit next to your Zenith. I have the exact setup except I’m still using apple routers.
As far filter goes, check out Network Acoustics, they make two passive filters namely Muon and ENO which goes between your router and Zenith. Read up on threads started by @grannyring on Muon and ENO. I’ve had ENO in my system and loved it. My system is listed in virtual system, just click on my username and click on Digital. Also check out posts by @audphile1 and his system for insight on ENO. While not cheap, it’s worth every penny and comes with 30 days money back guarantee, in case you don’t find it worthwhile. I recommend you buy ENO package which comes with amazing Ethernet cable on both ends.