Exactly, that is more or less what my landlord said to a neighbour who did ask them about it. My landlord is a housing association, so they are a bit different to private landlords. they told my neighbour that they can't really stop us having fibre.
As you said, it would not stand up in court and I doubt Zzoomm would want to waste money. I wonder how many other providers got this sort of agreement, as far as I know Openreach already have it.
I remember years ago when i lived at my parents, The GPO at the time asked my mum for permission to have a telephone cable going over the top of the property to a neighbour as it went from the pole to our next door neighbour. That would not happen now. Openreach done my next door neighbour fibre and did not ask me if i minded an extra cable going past my bedroom.
Nor did Zzoom when they did the one next to them.
As for installation, should be easy enough, from pole to wall and then down the wall to the splicebox and then a hole in the wall to the ONT. Some friends who got Zzoomm last week on my recommendation had a small problem on installation, for some reason the ONT would not connect, turned out to be a config problem at Zzoomm's end, got it sorted, just took a bit longer. They are getting 180Mb/s, not bad since they are paying for 150.
Adrian
Desktop machines Mac mini pro with macOS Ventura, also pc Ryzen powered with windows something or other.
Plusnet FTTC