Install Hangers approximately 3' apart. Hang the poly sheeting on the prong keeping the top of the poly just below the wall molding. Complete the containment by taping between the poly and the molding and by taping over the prong.
Hanger 1 can be used to support poly in front of masonry by nailing in a joint using a tension pin (i.e., tempered steel molding nail available at drywall supply houses).
Poly Hanger 1 is removed by gently pulling down on the outer tip of the wall molding which causes the back vertical leg to rotate away from the wall and Hanger 1 can be slid downward.