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I have used French cleats on occasion and have never had issues. The critical nodes are proper size/rating of mounting bolts and framing structure which must be sufficient to handle the load.
I have also made (fabricated) my own French cleats out of extremely dense hardwood ( Brazilian Walnut). Framed mirrors ( large & heavy) and framed art - also heavy. I milled the walnut on the Porter Cable table saw, low & slow cutting, but it turned out precisely as needed. Same principles apply for metal work. Useful I hope.
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