moms of 3

I have twins who will be 2.5 years old when #3 comes in December.  Currently we have an Honda Odyssey and a Mazda3.  DH drops off the kids at daycare and I pick them up.  Obviously, we can't fit 2 Diono Radians and an infant seat in my Mazda3 so we need to get a bigger car.  Since we already have a minivan that we normally drive the kids around in, I really want to avoid getting another big car.  Is there a sedan that will fit 3 carseats in the backseat?  Ideally I'd like to keep the Radians RF for as long as possible if that makes a difference.  We do have angle adjusters so that helps with front leg room.  Thanks!