Xbox Live - Multiple XBox On Network

Hello,
I've read posts detailing how to enable Xbox live services for xbox 360's connected to my network, and have things working for a single xbox.

My challenge is having multiple Xboxs connected to the network. Guides I've seen so far detail forwarding ports to a specific xbox. Is it possible to properly configure Sophos to enable multiple internal xbox' to connect to live services?

Thanks,
Tim