I will just have another meter installed on the shop. I currently have a 200amp on the house and a 200amp on the detached garage. What's another going to hurt. Haha. I can install the meter panel on the exterior and the breaker panel on the interior. I will run the feed wires between. Will also install the grounding rod. Anything else that needs to be done for inspection for the meter install?A common thing to do is to get a 400A service with (2) 200A service disconnects all in one box, one can service your existing main, and the other can serve your outbuilding.