Hello Nev! Thread Border Routers are HomePod mini and/or the Apple TV 4K (2nd generation) or the Apple TV 4K (3rd generation, Wi-Fi + Ethernet). The total should not exceed 10. Even in iOS 16 too many Thread Boder Routers will lead to problems building the Thread network. Same applies to using more than 25 powered Thread enabled accessories. This is a problem Apple has to solve. Best regards, Volker
Nov 26, 2022