I just feel out a spot. It's different all the time. It's about the room, the people, the setup. I like to be just behind the front in general. not too close but nice and near.. once I choose my spot I like to keep it. I think that's the interesting part about classes with no seating chart. every tends to keep their spot
far enough back to not be noticed, until i have something to say. close enough up, to hear everything that is being said.