I overlap the hardware cloth on outer corners to keep the apron going all the way around. You can either cut an extra piece of hardware cloth that's big enough to overlap the corner of the apron (so if your apron is 2' wide you'd need a piece a little over 2x2 so when you staple/nail it down the anchors cover the overlap of the apron sections) or you can stop at each corner, leaving enough overhang so that the apron will overlap (again if your apron is 2' wide, when you "end" at a corner you will want to go out an additional 2', and cut there. Then cut the wire horizontally near the ground so that the part going around the fence overlaps the next section, and the apron part overlaps the apron for the next section. Secure the top part to the fence, and anchor down apron.)
I did the second one as I feel it's a little more secure with the extra few feet of hardware cloth, and the fact that the corner isn't a completely separate piece.