In addition, there is the "difficult" plot with a given ridge direction from east to west while the plot is elongated north to south. We are negotiating with the municipality about changing the ridge direction, but we do not know how promising that is.
What about the rest of the residential area? Has everyone there complied with the ridge direction? If not, the change should not be a problem.
Honestly, I don’t even see that it will work at all: how do you access the garage parking space at the lower end of the plan? - try drawing the house into the plot.
You can drive in, getting out will be difficult =D
5.5m for a double garage is possible, but not ideal. Assuming a mid-size station wagon, it is about 2.1m wide. Two of them together leave just over 30cm on each side per vehicle to get out. In addition, you still have the garage door sill.
But honestly, how did you imagine getting out? Backing along the street? You need a place to turn around. Therefore, the house should be moved further down the plan.