Published ADFS 2.0 through TMG 2010

HI All,

 I have a TMG 2010 server in our DMZ hosted in Cloud Provider (  External Public IP facing to the Internet and one public Ip to internal )

 I have one Web Listener with  SSL wildcard Certificate (*.domain.com) to publish our helpdesk/OWA/ADFS Test

 Now i need a dedicate SSL (sts.domain.com) to create second web listner and publish my Production ADFS Farm.

So how do i do this? do i need a another External facing IP? 

Can we bind more ssl port in IIS ?

As