To enable this on your server follow these steps.
Step 1) Stop your server.
Step 2) On your master server (If you only have one server the server you are using) go into the Mod Manager and install the Atlas Territory Map mod.
Step 3) Go to Configuration Files and open the Config.json under Atlas Territory Map header.
Step 4) Scroll down to the following lines.
"ServersX": 1,
"ServersY": 1,
Adjust these to match the size of your server grid (eg change both to 2, for a 2x2 grid)
Step 5) Save the configuration and go and start your server.
Step 6) Once your server has started press the Start Atlas Territory Map button on your Game Panel.
Your Territories should now display in game.