Im driving a cx5 and am hoping 3 car seats will fit in the back! don't have time or energy to look for a new car right now.
I've gone for a Quattro for Bub, a safeguard for DS2 and a SNS high liner booster for DS1. Not sure if one of yours is a booster..
According to my calculations, they should all fit!
EDIT: just realised you have an X5, not a cx5! Lol! Bit of a difference! Surely the x5 is bigger than a cx5?!