Esper supports multiple provisioning methods. Developers find Android debug bridge (ADB) to be most convenient; others find that field-based provisioning is best accomplished using system-generated QR codes. For large numbers of devices, Esper provides provisioning using IMEI or serial numbers. And when combined with Esper-Enhanced Android, you can use zero-touch enrollment. Android for Work (AfW) is also available as an additional option.
NOTE: The Android version you run impacts both the availability and the method you need to follow to provision, this is one reason why we set our minimum Android OS at Nougat/7.0.