If I was starting again I would avoid Hive.
I had Hive installed around 6 years ago, when I replaced my combi boiler. I started with the Hive hub, thermostat and radiator valves, afterwards adding indoor and outdoor cameras.
My indoor camera failed after just over two years (and my outdoor camera would have soon after if I hadn't replaced it) because of a design fault, that has resulted in Hive announcing that it is ending its support for their cameras, effectively making any remaining, working ones, useless. No compensation offered. Following that they announced that they were downgrading the hubs.
So, pretty much all that is left, is their heating controls.
Now for the good news: I have to admit that their heating controls and app have worked well, over the 6 years I have used them.
However, given the way they have let me, and many other customers down, I will move away from them when the opportunity arises (probably the next heating upgrade). Put simply I don't trust them anymore.