title: Get active position on angular cdk overlay?
body: <blockquote>
    <p>Is there a way to get in the attached component to an overlay the
    active position ? For exaple I say to a tooltip to open above but this
    cannot be done and the overlay will open it below. I want to add an
    arrow pointing to my element from the tooltip and I need to now if the
    overlay is above/below the element to position the arrow correctly</p>
  </blockquote>