Anything to help tracking? Less clutter, fiducial markers?

Hey folks,

I was wondering what others have done to optimize tracking with their WMR headsets. Is a tidied up, less complex play space easier to track than a more complex play space? Can adding fiducial markers (QR codes?) or simple IR lights help tracking where needed, such as play space with less than optimal lighting?

Any insight would be appreciated.

Thanks,
Mike