OP, you are wise to call for help, I put crown molding (plastic) in our lanai for indirect LED lighting, and found the steel trough just behind the stucco. It took 3 drill bits for each hole, and lots of sharpening. Tried tapcon etc, and they would not cut through the steel. If you are lucky, they might miss the steel, but it is pretty hard to do that.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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