As an alternative to the Deco, I use this setup, which has TP-Link’s OneMesh built in
Connect to the existing router, and the extender – with three wired inputs – goes behind the TV
In two other rooms, I have an additional extender – so I have a Mesh network, but with a bunch of places to plug in wired stuff (like my office desk, and Sonos speakers in various rooms)
Whole thing works really well, and once OneMesh enabled on all the extenders, it’s the same Mesh Network as the Deco