Under the Vehicle:
When using a battery-powered GPS tracker, you have the option of a weatherproof metal case specifically designed for installation underneath the vehicle. Make sure you mount the case close to the edge, with the antenna pointing down.
On the Dash or Rear Shelf:
When mounting a battery-powered tracker, a clear line to the sky is the most important consideration. If you're not concerned about the tracker being hidden, the dashboard or the read shelf are perfect tracker locations, offering the best results. If you mount the tracker on the dash, make sure it's a few inches away from any other location-based devices to avoid interference.
Inside the Dash:
If you're looking for covert tracking, a hardwired tracker may be the solution for you. They're perfect for hidden tracking, because they're installed within the dash, much like a car stereo. And, since they're powered by the vehicle, you don't have to worry about retrieving the tracker to charge it.
Within the Seats:
If you're feeling ambitious enough, you can pop the seams of any seat within the automobile and install the device within the seat itself. Once you have re-sown the material together, it could be completely hidden from view. An area along the sides or under the cushioning material may be excellent places as it will be more difficult to feel the presence of the GPS tracker. This tracker positioning may cause some unreliability with location results; but, if you're looking to keep a battery powered tracker hidden, few will suspect looking within the seat.