Oh, ya, that's going to pose a problem with a single scan engine/environment/configuration-platform.
My suggestion would be to deploy a scan engine in each environment. I know this is a hassle and means you have to manage more systems. It would also mean you don't have a single pane of glass to view your assets -- *you may want to confirm with your sales rep about using the same license key for all of your sites*. BUT (sales pitch not intended) this is where our Lansweeper Cloud Sites can pull it all together for you by syncing each server and it's scanned assets into a single platform.
So, another idea might be to target your active directory for that specific location... or the OU for that location. Of course, this solution means you aren't doing IP ping/discovery on the same-numbered IP ranges.
Hope this helps.
Tim N.
Lansweeper Employee