Install ad-hoc to iOS device remotely (iPad Mini 4)

I have an ad-hoc app that our company uses internally. I am at a different physical location than where the app is used (on iPad mini 4 units). Is there any way I can remotely update the app from my location?

One solution I thought of was to use TestFlight, but that creates an app that will expire in 90 days and has potential for long term problems if it expires before an update.

Currently I have to go and gather all the iPads and bring them to my location, install the updates by plugging each unit into my iMac.

Is there a better way to do this? Can this be done with DeviceManagement? (assume I know nothing about this)

Install ad-hoc to iOS device remotely (iPad Mini 4)
 
 
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