If it’s free, I say absolutely fuckin go for it. There aren’t really any cons at all that I can think of. They’ll need to do some wiring obviously, and there’ll be a device installed outside somewhere, and I believe usually a new port inside that’ll replace your old phone port or whatever you currently use. But there aren’t really any disadvantages to it besides needing to find a few hours to be at home for them to install

(If you’re in a rental, I don’t believe the landlord is actually allowed to say no unless it’s heritage registered. If you own, I dunno, you might have a couple of screw holes to patch at most)