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Hi there,
Great question! Not much space is needed, as the brackets flex very minimally. At the very least however, there should be 3/4 of an inch of clearance to be safe. Your conclusion regarding unwanted movement is correct, as there would be a much bigger issue if that were to happen. To answer your original questions though, I’d make sure there is at least 3/4 of an inch for possible but minimal movement.
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