
eero
Pro 6 Series
Easy, reliable, smart home ready; but paid features.

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My parents have same kind of house, with their Xfinity broadband in the 3rd floor TV room. I ran Cat6 across the back down to the 1st floor for back haul and an Orbi WiFi6 mesh router now gives great signal house-wide (yard too!)
I went from an old Orbi RB system to the 770 and have loved it! Sorry to hear so many haven’t. But so far it’s been great for me all around.
I’ve used before netgear Orbi mesh WiFi 6 router with two satellites. Worked well. Expensive but I guess was worth. Still use it now in the apartment but with one satellite in the bedroom only just in case
You could get a 3 pack mesh network bundle like the Netgear Orbi system with a dedicated wireless back haul. You would plug the main unit in behind your ISP router and then place the satellite units around your living space. Just make sure that you place one of the satellite units mid way between your deadzone and the main unit so it can throw the signal the rest of the way for the last unit.
I have to agree on “consumer” grade mesh systems, I have tried Asus and two different Netgear Orbi systems (last one cost me $1800 at the time) and all I get is headaches. They last for a month or so and then lose satellites and devices are always dropping until I reset it and then a week later all over again. So I decided instead of dropping another $1200-1800 on a Wifi 7 Consumer Mesh I would invest in Ubiquiti equipment, now I don’t have it running yet but will be using Mesh on the second floor AP as I don’t care if it’s full speed or not.
Orbi is fine. Your problem is the wireless backhaul between the two access points. The only way to make it better is to run ethernet or add more orbi access points to improve the mesh backhaul. You will add latency and spend more money by adding more acces points. It would be fine for doomscrolling, not great for competitive games. If you have coax cable run throughout the house you can try MOCA adapters or ethernet over powerline.

eero
Pro 6 Series
Easy, reliable, smart home ready; but paid features.

TP-Link
Deco XE75 Pro
Great coverage, easy; but unreliable Ethernet, poor app.

eero
eero Max 7
Incredibly fast, reliable; but very expensive, limited control.

eero
eero Pro 7
Fast, reliable; but paid features, needs internet to function.

eero
eero 7
Easy, reliable coverage; but no 6GHz, paid features.