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 have left. This leaves roughly 6 - 8 hours after school of issues. We have thought of arming the carts but the distict doesnt feel that anyone would arm the alarm. Is there any type of asset protection? Maybe use a Securitron GL1 Lock and Card Access in the hallways?

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