I am very familiar with the vehicle tracking and monitoring system you are writing about, because the company where I work has a fleet of over 1,300 vehicles.
How do I know that?
Thus, for these GPS devices, I provide SIM cards for GPRS data transmission, configure them and monitor their consumption.

A large fleet of delivery vehicles and trucks are connected to a special system for creating movement routes, in order to optimize the path of goods delivery and thus shorten the driving time, the emission of harmful gases, and speed up the delivery as much as possible.
Some vehicles are connected to the TAPA system, a special standardized transport regime required by individual clients.
As for passenger vehicles, there are mini vans, which are used by sellers in the field, as well as classic passenger vehicles used by other colleagues.
My position does not provide a permanent official car, but I take it from the fleet if necessary. That suits me, since we have organized transportation to the company, and by driving that organized transportation, I avoid driving cars in the crowd (I don't need an additional official car because I have my own private car, so a parking spot for official cars would also be a challenge for me).
As for the monitoring of those "private" official cars, they are subject to a special monitoring regime, especially related to driving speed, as well as monitoring of fueling at the pumps with which we have signed contracts, since we have an internal gas station that provides cheaper fuel, so it is higher cost if colleagues pour fuel at external pumps.