SUS with C Folders in DMZ

Dear Experts,                

We are planning to upgrade to SAP SRM 7 EHP2, along with the added functionality of C Folders and Supplier Self Services. We have the SRM Technical Scenario Classic with MM-SUS integration. C Folders  is planned in DMZ (De militarized Zone) outside firewall. Since the system will be exposed to the external users. Also since we are planning the MM – SUS integration, should we have the SUS system in a separate server along with C FOLDER? Please let me know the possible options.

Thanks,

Vardhan