Sounds good @audio-b-dog
just keep an open mind…
AT&T fiber comes into your house and into the router/hub they provided, correct?
from that hub, you connected your TP Link Deco using Ethernet cable. That’s your gateway mesh node. It now broadcasts wifi to other mesh nodes. If you places your tp link nodes around the house, you should be able to test your wifi speed using something like ookla app on your phone or even just by typing speed test into google search. If you stand next to the mesh node that feeds the Meitner, what speed do you get on wifi?

