Hi. I'm struggling to get two convertibles (boosters with harness, actually) and one backless booster in my 2016 subaru outback. I've tried two tranzitions, but they leave room only for an 11" backless, whether placed side by side or each on a window side. Huge problems getting the backless booster belt buckled if it's in the center. We need a belt positioning clip for the backless (many sold now do not have them). I prefer not to put my twins (5.5 years old, 45" tall and 41/47 lbs) in a belt positioner only, but would do this if I could find a solution. But even the narrow high backs that are slimmer than the tranzitions cause problems, because they have to be dead in the center of the subaru bucket seats, so I lose the advantage of the trimmer fit (I have the snuglock tranzitions, so I can push them off center a bit before locking them down). Has anyone put two high back harness seats and a backless booster with belt positioning clip in the back of their 2016 outback? Any help would be super crazy greatly appreciated!!!