In my 3011, it was under the cabinet closest to the entry door. I had to remove the bottom drawers to get to it. It's a box about the size of two decks of cards.
The fine Amish craftsmen did not attach mine to the floor and it was pointing to the left. Once I had it aligned & attached, I did the reset. It's been working great for the last 2+ years.
DW, DD (sometimes), DS (sometimes), 2 camping poodles
2017 Forester 3011DS