SEPM Console and Live Update Administrator installed On the Same server

Hi All

I have the scenario

1 DMZ server installed the SEPM console for update definitation for clients

1 internal server install the Symantec Mail gateway 7.0 on the Exchange 2013 server

I want to update the Symantec mail Gateway 7.0 definition, do I need to install the LiveUpdate Administrator (LUA) on the DMZ server?

Or can I use the SEPM console to update the definition for the Symantec Mail Gateway 7.0? If so how to configure it.

I try to install the LUA in the SEPM console, it say it is not a best practise? But do i do it, if no other solution.

Thank alot 

Best regards and thanks

Cyril