The CAN bus cable (entering in the center of the photo) runs over the footwells, just behind the tray, and enters behind the compartment through this narrow gap between the tray and the body. The Tattler is held in place between the bag of insulation and the inner body wall with the rubber feet against the wall. The spot that gets warm on the Tattler is on the bottom, so the rubber feet allow some air circulation and the metal body should also carry heat away. The bag of foam insulation is part of Carl Medlock's super-duper upgrade to Tesla's sound insulation package. If you don't have it, it's just a ziplock bag full of insulation. Below the bag is where the auxilary hardware devices for the upgraded (JVC) audio headunit were originally stored. (We replaced all that stuff with a self-contained Alpine unit that has a user interface designed for humans.)