The use case for us is that we have iOS devices for use in a manufacturing facility. 95% of our devices should never leave our facilities. It is important for us to know if a device shows up anywhere else.

Forgot to mention .. can you make your application report their location back when it detects that it has stopped moving or something then check ?

Or can you establish a service area for your device and then in your app check to see if it is in the geocoded area ?

If you use the API you can get the location of the device(s) and check the geofence

https://simplemdm.com/docs/api/#retrieve-one
https://simplemdm.com/docs/api/#retrieve-one

"location_latitude": "75.13421212355",
"location_longitude": "-14.313565422",
"location_accuracy": "60",
"location_updated_at": "2015-10-01T15:09:12.000-07:00"