I hung a very large antique mirror with same situation. Had trouble finding the studs with my stud finder until I changed the setting to "metal"...surprise! And of course the placement for the hook was right between the two studs. A mollybolt would not work because the screw would have to protrude a bit. I have a wire in back, so I actually but a screw in anchor in the wall flanked by two 100 lb test picture hangars. I figure with 3 sturdy hooks it won't go anywhere...so far so good!
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