"For our first round of testing mesh networking kits, our sole criterion was simple: Does it exist? In the future we may need to rule out mesh networking kits by speed, specs, or price, but for this go-round we tested all of the consumer mesh networking kits that were available at the time (not announced, not in crowdfunding, not preproduction). That group included the Eero, Luma, and Netgear Orbi offerings, as well as both the HD and standard versions of the AmpliFi kit. Google Wi-Fi, Amped Ally, and Plume will have to wait for next time."
Note that out of the box, Airport does two step wireless network extension: wired-to-wireless base and wireless-to-wireless extenders / relays. You can have multiple wired-to-wired and wired-to-wireless bases on the same network each with its own wireless-to-wireless extenders or relays. This has worked and been solid (no reboots needed) for years.
