You can not connect the UTR to the LTE router and view the UTR when the car is off.
I already have the UTR connected to the LTE router.
All this allows is for you to use the same WiFi connection as you do with the MMI, it means you do not have to switch to the UTR WiFi to connect and then switch back to another connection for the MMI.
Connection to the LTE of the car does not allow access to the UTR which is disappointing, going to try a sim card setup separate to the car to see if you can access the sim card WiFi and then the UTR to see if this works.