Five feet even here.
I went to the store and tried the stacking units out, decided not to stack them as I could not reach the back of upper unit.
Another decided factor was possibly having to alter our dryer vent location, so I opted for side by side.
We added a granite top and 2 new cabinets above with under cabinet lighting (nice for folding).
The cabinet person made a frame behind the cabinets so they are not back as far and I can reach at least the first shelf.
I can as Advantages and disadvantages to both stacking and side by side.
Q