HI Guys...an extension of my earlier question here

Moving to a new house with three Deco M9+ units.

Expect to use TP-link AX1500 as the main router/switch to connect with the ISP, and the Deco in AP mode.

And I just found out a few of the Cat5 outlet in a few rooms, and there is a switch board that I suppose I could setup wire connection from my core switch to the room.

I wonder if its possible that I wire each deco to one ethernet port to form the mesh?  Is that going to give me much better connection with one single wifi AP across the house?  Or would that cause something called a network loop?

Sorry that it may sound like a stupid question to many, but I just thought having deco to backhaul with each other wirelessly is not as efficient as each of them getting their connection via wire from the wall?

Am I making any sense?