Roaming users and Forwarding server

Roaming users and Forwarding server

A little confused as to what agent to use to support this.
https://www.manageengine.com/products/desktop-central/secure-communication-of-mobile-users-using-forwarding-server.html
According to this they want you to have the same fqdn appear internally as well as externally. Do you have to create a remote office for this and use the wan agent? if it is the same fqdn why won't the LAN agent work? Is there some benefit to the wan agent? half of my workforce work from their homes using straight up internet no VPN so there is no Distribution Server or anything like that.

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