The (hopefully) definitive guide to load balancing Lync Edge Servers with a Hardware Load Balancer

We are just entering into this and reading the deployment guide it indicates the edge external needs to be a public addressable IP. What security approved was to have the Edge server behind the F5 on a DMZ VLAN. So from the above it sounds like it is possible to do this by configuring Lync by enabling the AV NAT and providing the public address that F5 will route through to the Edge server. Can someone confirm this type of setup and what the downside of this approach is? Otherwise my Edge will need to go on the Public DMZ, which they want to avoid (yeah there would be a firewall between it and the public-- but no F5). Thanks!!