I started a similar thread last month, and got few recommendations. I landed with eero Pro 6. The speed is amazing when you are next to it. Sometimes the signal is so weak when I have closed doors (which is surprising because I am around 30ft away from the router).
I had one issue that frustrated me, and the support did not help. I was downloading massive amount of data from BackBlaze (7TB), I have one eero wired to the modem, and the others connected wirelessly to it. During that download process which lasted over 3 days (the wireless eeros lose connection, and give me a red LED).
The support person told me that I am having a lot of coverage and they saturate each other (that does not make sense to me), because I am having one in each floor. I feel it’s a software issue.
Other than this instance, they have been running great, with no issues.