Protecting AC Units?

I have seen a couple devices out there like the AC whip but for an apartment community with 100+ units, it is hard to justify the cost with installation.

Has anyone just used an 18/2 wrapped around the freon lines like a thermostat wire? Then when the Freon line is cut, they would be cutting the wire? The wire could be connected to a relay/siren or an alarm?

Any other ideas for protecting mass units of AC's? I am not concerned with each unit being on it's own zone. All the units behind a building could be on one zone.

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