I'll agree with the others, it's a front wheel, no worries about the bracing angle.
It's true though, those SP hubs are tiny. I've just started dealing in them, have a couple here. I would be very interested in your experience with it from a performance point of view. I have one built into a wheel for a demo, but other than hooking it up to a light and giving it a spin in the truing stand, I have not tested it. The claims of lower rolling resistance seem to be accurate.