Can you borrow the outboard latch for a center-installed booster seat if the latch is not being used for anything else? I know you can't install a carseat with borrowed latch, but the latch for a booster is just to keep it from being a projectile, the seatbelt does all the restraining work, right? At least, logically, that's how it seems to me. I have searched on here and car-seat.org and cannot find an answer to this specific question.
Seats in question are a Monterey and an Oobr, in an Outback and Forester.
I have also read 1 of 2 of our car manuals (same manufacturer) and it does not address this specific issue. It simply says that there is no center latch because carseats don't fit well there, that they should be installed outboard. Unfortunately, the Monterey won't fit outboard...at least, not with the door closed.
TIA for any help!