inquiries about servers of dlp

Hi guys. this is urgent hope you could help me.

here is the scenario::::

we actually had existing environment:

here are details;:::  1 physical server with enforce and detection

                            1 for network monitor

what we need is if this is okay to add detection server to other domain.

lets say this is domain one and domain two.

domain one got ::  1 physical server with enforce and detection

                            1 for network monitor