In Europe early 9x7 body styles had a spare as I recall. It was mounted to the rear Frunk wall just as in the 9x6 series. You can get the bracket and DIY same.
BUT!!!! Be EXCEPTIONALLY careful drilling holes for the mount’s rivets and mark your drill bit for correct depth (or use a collar) as gas tank is directly behind. You obviously do not want to puncture it.
A good alternative is to up your AAA membership to gold plus.
Good luck
