Poor RSSI on Ring Video Doorbell (2nd Gen) with BT Smart Hub – PART II

After Ring sending me a new doorbell, and Chime pro, to try and resolve poor RSSI, I contacted my ISP BT about the poor RSSI….. A BT engineer came yesterday and did lots of testing on the BT Smart Hub router which, as suspected, is correctly positioned and really close to the Ring doorbell (about 3m), and working as it should. The engineer also replaced the wall socket and the broadband cable to the router (which are both only 9 years old), but this made no difference either. My broadband speed tests were all excellent too. This is the interesting bit though. The BT engineer said that they are seeing lots of BT customers who have Ring doorbells who are having the same issue. BT is one of the largest ISP providers in the UK, with millions of users. Surely Ring should be fully compatible with BT routers? Is there some sort of incompatibility between Ring devices and BT routers, does anyone else in the UK have this problem/know anything about it? What would be a good alternative to a BT router – OpenReach, fibre, FTTP please? I know the Ring website lists somewhere on it routers that are best for Ring doorbells, but do these work/are available in the for BT OpenReach fibre?