Same problem - decking either side of us. Terrier goes bananas because he can't reach the rats.
I asked Environmental Health (wasn't sure what else to do in UK -dog sorted them out in France) and all the chap said was, just put poison down. Hate doing it, but that's what we do. It's safely tucked away by the boundaries both sides. Unpleasantly, I'd a rat dying on the lawn the other day. There will be lots - and a lot more very soon as Spring approaches. :(