code: def top(self, z: float = 0.0) -> Location:
          
          return Location(self._position + Point(0, 0, z), self)
docs: :param z: the z distance in mm
          :return: a Point corresponding to the absolute position of the
                   top-center of the well relative to the deck (with the
                   front-left corner of slot 1 as (0,0,0)). If z is specified,
                   returns a point offset by z mm from top-center