Fair point, but being near two sources of disruption is worse than being near one.
Also, I wonder about the long term legal issues about a roof with expensive infrastructure on it ?
I'm not qualified to have a good opinion on RF, but I do know that professional equipment can be badly affected by malfunctioning domestic kit.
Some friends of mine have a heavy duty mulcher and pump for their toilet, and it sent spikes down the mains which crashed PCs, sometimes.
This took a while to track down, one does not normally try to correlate flushing with crashing.
That was merely a funny story for them, but if my equipment made the telco stuff go wrong expensively, that could get painful.