I have the new eero 6 setup. Three identical units and it supports wifi 6. Right now, only my wife and my S21+ use it I think, most of our other devices predate it, but there will be more in the future.
I have a house split 75% down/25% up, but the internet was upstairs. The signal was fine there and in the front of the house below the upstairs, but as you moved towards the backyard it got weaker and weaker. The eero supports wired backhaul, so the 3rd router downstairs that’s close to the back of the house is connected via ethernet (the house came wired with it) to the 1st one upstairs. The 2nd downstairs router is close to the front and connects to either the 1st or 3rd router via wireless.
I now get several hundred Mbps over wifi all over the house, and even on the back patio. With my previous Amplifi HD setup I did not, it dropped to 20 Mbps in the back of the house and was pretty much nonexistent on the patio.