Apple Carts - How To Secure?

Has anyone secured Apple Carts in a School? I have a school district that has started rolling out Apple Carts that have 30 iPads each inside each with charging cradles. Each school has roughly 54 carts. They do not want a room to be a so called parking lot. The problem is each classroom doesnt have any intrusion protection and the building alarm isnt set until night time after the janitors...

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