Wrist Tracker real world pivot point

[danwrong]

Hi all,

We're trying to work out where on the actual wrist tracker the pivot point is.  As in, if you ask for a trackers location, what part of the wrist tracker itself does that location point to?  Is this covered in any documentation?  I've not found that info yet but need it in order to use it to track a prop (like a gun controller, for example) and have it line up correctly with a model in game.

Second question, can we still work with wrist tracker and finger tracking data via Unreal's Steam Input or does it only support OpenXR APIs?

Thanks!