Tbh if you own the place theres little they can acctually do unless you do something actually illegal, I'm in a similar set up, Mid-Terrace with wooden fenced gardens that in my case go to a bit of waste ground and then a school field, situated my range so any backstop failure goes into a rubble pile and no further (it can happen so always account for it), backstops wise if you're unsure there was a thread a little while ago that has a lot of good ideas and if you're ever unsure you can always ask here and one of us will help.