I've installed the splitter, using a zip tie to ensure it curves away from the rear shock absorber and the passenger peg holds it steady for now.
So, a word from the fool here: don't do this, or at least remember to take it out before going through a downpour.
Reason: the splitter is energized at least in the pins, and if even a bit of water sneaks past the rubber boot and rest in that area and cause intermittent shorts on the signal circuit, causing the system (BMS, I'm inferring) to shut down to protect itself. I experienced this recently after riding through a downpour, where every time I made a complete stop, the bike would cut out. Pulling out the splitter fixed the issue. Light rain did not cause this, though, so the risk profile is sneaky.
Related: I am very much looking forward to a SuperCharger, and possibly a newer Zero where the Anderson port is more accessible than on the 13.