We have hung several with no problems using standard drywall hangers. Even wall mounted a TV on the outside wall, with the expanding type holders. All of this on a block style gardenia.
Can you elaborate with the problem you are having? If you are trying to "hit a stud", these tend to be METAL, and your will not be able to drive a nail into to it. You can drill a small pilot hole, and use a sheet metal screw and hook.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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