You don't need much space in between. Our garage setup is almost identical to yours. We did 3 single garage doors, 9' wide, 8' tall. Each has 1' of brick in between, on the corner, 1' each side. We even have a wing wall on the front of the house shielding the 3rd garage from the street, and we can get in and out fairly well. We have a 20' square pad in front of the garages, extending past the third, and then down 10' past the front of the 3rd toward the backyard. Allowing a 4th car, or a turnaround.

One thing I'll mention is that you need 2' of clearance on each side of the car. So on that 3rd garage, you want 12-13' between the foundation walls. We have about 10', and it's not enough to get in and out on both sides.

We oversized our garages big time, but have a couple of quirks with not enough space to open doors.