I have the TPLink Deco P9 setup, which uses powerline backhaul. It’s a complex setting - I have two buildings (a house and a barn), and I have ethernet connecting the two buildings, but don’t have internal wiring in either the house or barn, and they’re both reasonably large buildings. So I use ethernet backhaul to link the two buildings together, and powerline backhaul to create the mesh within each of the buildings. I have 6 access points there. Which works great most of the time - basically I’ trying to create a large scale network, and I’m trying to make it seamless. Ignore the 2 building / ethernet thing — it’s a good consumer set-up. Based on friends’ set-ups, the Eero Pro (eg, the set-up where you have all Eero Pros) is some better at (a) maintaining a wireless backhaul connection, and (b) speed of connection at some distance. For your use case, this might be better. What I like about the TPLink is it’s fairly stupid-proof, though I will admit that upgrading firmware is a total PITA to get all the units flashed. And when you roam across 2 APs, you occasionally lose connection briefly, which is almost unnoticeable except when you’re on a WiFi call or FaceTime. So that’s one place.
My second place, I wired the whole darn thing and I have the best set-up in the universe (unless I lived on a corporate campus). I have Ubiquiti UniFi- a USG, a Cloud Key, a core 24 port managed switch and a couple subsidiary managed 8-port switches and a bunch of AP-PROs. That system is absolutely rock solid. It’s not for the faint of heart; you need to learn a bit about networking. But when you are on WiFi calling and you walk around the whole house, you never notice losing a connection for a second - it is just plain as good as anything I’ve ever had at work - solid. It’s also more than most people would spend on home networking. But that is the gold standard in my mind to compare from a performance perspective, and they’ve started to come out with more consumer-friendly gear.
Of course you can’t really compare these two set-ups apples to apples; one has a country internet connection, the other one a near-in suburban one (though both from the cable company). One is all-wired for backhaul, the other one is using powerline and WiFi backhaul. So YMMV.
However, what I think in your use case if you want the absolute best and don’t want to go crazy is to look at the UniFi Dream Machine (which incorporates a router, basic switch, cloud key) and get 1-2 extra AP PROs. If you can possibly manage to wire the backhaul to 1 or both of them, then you’ll have a set-up that’s functionally the same as my bomber one. If you rely on wireless backhaul I don’t know how great it’ll be, but I know that UniFi makes a product that is WAY more sophisticated than any of the consumer companies. But it’s a bit like Roon - forum / community support, frequent updates, you gotta get to know it. If that sounds awful (because it is more technical than Roon; though if you can install a ROCK you can do this, promise) then stick to the consumer grade stuff.