Has anybody customized the storage compartment that Toyota custom molded for for their tire compressor/goop kit? I am swapping it for a Slime one (would link but I can't get it to work). I am pretty sure there is room for it (I removed the molded piece, and there is a lot of empty space under it). It's just a question of the most elegant solution for using the space.
Pull up the 2 rear seat cushion, there are lots of spaces underneath. You just need to secure it so that it doesn't move around and hit the battery (or something looks like a battery) under the middle arm rest area. There are only 2 latches under each seat, one at the front middle and one at around the corner, use some force to pull it straight up.