Looking For Recommendations For Temperature Monitoring At Storage Facility

I have a storage facility looking to monitor temperatures in 36 individual storage units. All 36 units are in one building about 300 ft long. Only need to worry about freezing temperatures for the sprinkler system. We are familiar with this type of monitoring on small scale (1-4 sensors) but haven't provided a temperature monitoring system of this size before. If this is successful, we will look to implement at customer's other facilities in 3 different states. Servicing the equipment in multiple states is a big concern, so we need something reliable. Any thoughts? Thanks in advance.

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