Need help understanding sites/groups

Hello!

    I am quite confused how groups and sites should be setup when looking at SAE and Techdirect. Hoping someone with knowledge can point me in the right direction.

We have multiple sites connected via a WAN. I would assume I should have (1) server with SAE installed, and have all devices across my WAN added.

Within SAE I have these devices assigned to Groups, and those Groups have different physical addresses since they are in different cities.

My confusion then comes when I look at TechDirect, as the devices get added is listed under Site: Default, Group: Default.

So is this fine? Do I need to manually update and move things around in TechDirect? Do I need to deploy a SAE at each office so that I have multiple "Sites" in Techdirect?

Thanks