In bigger homes your best bet is to find a way to run Ethernet. My experience with mesh was mediocre to bad and I feel like that’s what I hear from everyone else who tries it.
Ubiquiti mesh stuff works very well and is an overall polished experience. Supposedly their APs are at least distantly descended from OpenWRT but they are not open source. Their platform is pretty open in terms of integrating with other stuff and not locking you in, at least.