Most of the models for this type of heater are designed with several safety features to ensure your safety. They are sturdy enough to withstand any type of damage. But, they can still cause several safety problems. In order to avoid problems from happening, make sure that you follow the instruction properly.
If you have not yet read the user manual or the guidelines, do not install the unit in the 12 –volts outlet of your vehicle. Follow the manufacturer’s recommendation and advice. If it is designed to be mounted on the dashboard of your vehicle, then mount it. If it entails a set of mounting brackets for installation, use the brackets.
More importantly, only use the right kind of heater for your vehicle type or model. Do not try to install or mount a unit that you have no clear idea of its technical specs or its installation method.