Snapping Bones or Gizmos in Animation Mode

So I see if in selection mode I can snap to different objects vertices, or surfaces. however, is there a way when in animation mode and controlling a Control Rig, to snap the foot to the floor or a different actor or vertices. I see the option for these, but I can only get grid snapping to work and plane snapping to do anything. The other options do not do anything in animation mode. Is there an alternative way or something?