We need a Proxy Server (TMG?) for the external web access

https://technet.microsoft.com/en-us/library/mt346419.aspx
Keeping that in mind, these are the components you're going to need to keep in mind for deploying your Edge successfully:
Edge Servers
Reverse proxies
Firewalls
Directors (these are optional, and if they're included, they'll be located on your internal network)
Load Balancers (you can have DNS load balancing or a hardware load balancer (HLB), but for a single Edge Server, this isn't needed)

Start by reviewing the linked Microsoft guidance and the listed Edge Servers, reverse proxies, firewalls, Directors, and load balancers. The issue names no files, tests, or entry points, so first clarify the desired proxy deployment and how successful external web access will be validated.

Vom Indexierungsmodell aus dem Issue-Text verfasst.