Yes. Monimoto can be used in a car.
Choose the car profile when pairing your device or change the profile in App-> Settings -> Connect -> Settings, don't forget to hit 'save' in the upper-right corner.
Then test an alarm to make sure the device installation location allows it to get signals and you are able to get location updates. If location accuracy is poor, or locations are not given - it might be the installation location in the car is causing signals interference to the device, and it needs to be installed somewhere else. Some experimentation is necessary to find the best combination of being hidden while at the same time being able to get signals.