Flow Meter

I’m looking to purchase a flow meter to pair with my Rachio 3. Had so many problems with leaks, broken valves that don’t water at all, etc.

Problem: there’s no room after my back flow preventer to install a flow meter. It’s like 2 inches to the valve box. So I’ll be installing before the backflow preventer and at that point I might as well install inside. It’s all copper piping before my flow meter, so I need a flow meter that’s…

(1) compatible with Rachio 3
(2) NSF-61 certified for potable drinking water
(2) compatible with copper piping

Any suggestions? Nothing on the Rachio support website seemed to hit the requirements…