I’m in the middle of rotating the tires. There isn’t much room for the spare, about 1/2 to 5/8 of an inch. Both boxes are attached by tape to the sidewall. In fact, the larger one got bumped by the spare and dislodged when I was removing it.
My hitch was installed at the dealership before I picked the car up so I don’t know if the mounting method for the box would be different if done by port, but I doubt it. I have enough slack in the wires to move both further rearward and mount them where there is more room in the spare tire well behind the bumper at 5:00 position rather than the 4:00 position they were in.