Thanks for reaching out!
As a confirmation on the devices, the setup should use the following:
-NFC Readers and Geotab NFC tags
-Satellite Add-On (Idirium): IOX-SATIRDv2
You can find the Support documentation for all these devices and add-ons from the following link:
Furthermore, the DriverID and the Immobilization will work without cell coverage, as all of it should be stored on the devices itself. We support up to and including the relay, but if you choose to use it for controlling the ignition of a vehicle,you will need to support the installation yourself as Geotab does not support the usage of an Immobilizer. Please make sure you read the warnings on the SPR-RELAYKIT Documentation under IOX and Add-On Documentation using the above link.