Assistance selecting cellular router type

I am using an mqtt gateway with (6) 4-20ma receivers (PR52-9), sampling once per hour. I am trying to select an appropriate device and data plan for this setup.

What is the size of the data packet for each transmission?

Is a CAT M device and data plan sufficient or do I need a something like CAT 4?

Cat M should be more than sufficient.

MQTT messages are very efficient. I would estimate each transmission to be less than 500 bytes or so. That said I have never checked the exact size. If you already have the devices you can probably use WireShark to check the size.

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