If you want simple, zone-based triggers, also take a look at our Proximity Beacons and SDKs.
You can also do zones with Indoor SDK, yes. I don’t think there’s any ready-made abstractions for that available, but you can just take the (x,y) coordinates provided by the SDK, and in the most simple case, check if the distance between these coordinates and the center of your “zone” is less than some number. That’ll give you simple, circular zones. For rectangular zones, check if the x and y fall between the boundaries of the rectangle. etc. etc.