OP, if you have vinyl siding you should also have OSB over the entire outside wall, therefore if the metal object is not real heavy you can hang anywhere. What i have done is to use a 1.5 inch stainless steel screw with a 1/2 inch spacer. Place the screw through your hook, place the spacer on the screw, and then screw the assembly into the wall just below the ridge in the siding. The spacer will allow you to tighten the screw without caving in the siding. I have also used the hooks that go into the horizontal groove of the siding and IMHO these work well for light duty.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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