Can Ping be placed inside a glovebox or under a seat?
Ping uses three different antennas to function properly - bluetooth, GPS and cellular. The clearer the view of the sky obviously the better the device will work.
However, as long as Ping is not placed inside an enclosed metal box, such as a Faraday Cage, it should work just fine. Since most glove boxes have a plastic, not metal front or side, Ping should work and since most bike seats or motorcycle seats have at least one non-metal side or are open to the air, you'll be good to go!