To me, the biggest issue is the 2 rear facing car seats the kids will need once they hit one or so.
How tall are you and your wife/gf? The front seats need to be pushed up to accommodate the rear facing seats. I have an sq5, and it’s impossible to comfortably fit a rear facing child seat directly behind the driver or passenger seat (it does fit fine in the middle seat).
I’d imagine you can make a double stroller work- we have one and it doesn’t take up much more room than a single stroller (it’s a really expensive model, however).