Well...yes, maybe.......never........oh, who cares? The local code enforcement people...
Placement of the boxes and wiring, everything, goes back to life, health, and safety issues first, the insurance companies next. NEC was started as Part 5 of the NYC fire code....now look where it is at.
The insurance companies like to receive money, not pay it out. So if the work is done properly the pay-outs are reduced. Then they are happy.
Now for opinion....there really isn't a good way to do back to back without conduit. Most places I have been will not allow back to backs, anyway.
I even had a hospital that would not allow outlets in the hallway walls of the patient rooms, all conduits had to be firestopped at the box, and conduit had to be physically connected to an open wire tray. :shrug:
So, to answer your question, well, maybe, it might, oh, heck, get the local code guy......
