You can use a single AES to manage machines in different LANs/WANs.

You need to create a group for these machines in the “Computer Catalog” and configure the public IP from your router.
You have to open TCP/16136 and TCP/16139 in your router/firewall and redirect them to the private IP of your AES.
You have to create a specific installation package in AEA to indicate the public IP for the console.

Here is a little manual (sorry I know that it’s in spanish): http://www.infratech.es/avast/eas-acceso-remoto.html