Lync 2013 iApp template

I have read through this a few times before. In it he mentions, "NAT awareness was built into Lync 2010 to help in environments in which Edge Servers are deployed behind NATs. By enabling the NAT awareness, Edge Servers will refer clients to their respective NAT address in order to route the users in correctly." Which is how I intended on building this out. In his example he used routable IP addresses for all the external edge services but I'd like to put them on a DMZ private subnet and NAT through our firewall using the nat-aware capabilities of Lync 2010 and later (exposing a windows server by bypassing our firewall just doesn't sit well with me). Has anyone built a similar solution? If so, my real confusion still resides in the iApp where it asks about adding the edge server pools and using the publicly routed IP address. This might help to make sense of how I envision this working. Technet documentation for NAT'd A/V service. http://technet.microsoft.com/en-us/library/gg425882.aspx