As iOS devices make up a huge portion of the market, we are able to offer multiple ways of onboarding your devices. Each is slightly different but all are very easy to achieve.
Apple allows their devices to be in 2 states; Supervised and Un-Supervised. Supervised devices are usually school owned devices and must be enrolled using either DEP/ASM or Apple Configurator 2 (or higher). Supervision means the Mobile Guardian MDM Remote Configuration profile is installed and the device and allows for greater level of restrictions to be used.
Unsupervised devices can also be enrolled into the dashboard using the URL.
See also - Add iOS 11 devices to your DEP account