I find cargo bikes a bit one-sided, but trailers are practical (as is the case with cars, by the way). You have a normal bike with which you can also ride normally, but if needed, you can attach a child to the back. The time to attach is almost negligible once the trailer is set up. We mainly bought the trailer for after the move. Especially since we are moving to the countryside and will have about 3 km to the kindergarten, with a relatively direct connection via a 1.5-lane road through the forest. You’re not much faster by car there, and a bit of exercise doesn’t hurt if you otherwise sit in the home office.
But the bike is a good point. If I read the plan correctly, it suggests that the bike space is only accessible if the rear parking spot is free. In the worst case, both cars have to move to get to a bike. Entering from the side is also rather stressful at 80 cm; I currently have a similarly cramped situation with the bike in our basement compartment.