OBTs can be arboreal or Terrestrial. The position you are seeing it in is standard for arboreals that are resting. Do some research on your T. Google searches and the search function on this forum are great resources.
Read these threads. They've got info that apply to ALL Ts, not just roseas. Part of this hobby is learning and educating yourself. I came into this hobby with NO knowledge whatsoever about a year and a half ago, maybe a little less. Since then I've taken the time to inform myself. Do the same. It makes the whole experience more enjoyable.