I am sure it has been asked and covered before but I couldn't find a definitive answer.
Are there any WiFi 6 plug n play router/modems on the market for use with BT Fiber 900?
I have a Netgear Orbi RBK750 and IPV6 works fine with BT. They seem to have updated the firmware for newer models to work with BT now.
I use Fibre 900 and connected it using a Netgear RAX200 WiFi 6 router directly to the ONT but this frequently disconnected. I sent it back. I now use Unifi equipment and this has been very stable without a single drop out. You will only get faster WiFi6 speeds if your device supports WiFi6.