I'd be guessing, but the obvious answer is to put a slight extension so the flattener is slightly away from the camera.
The "gotcha" with this though is the optimum distance is then all up the creek. While the blurb says it is for a DSLR, I suggest that someone in R&D didn't actually try it on a DSLR.
I could be quite wide of the mark of course.
Gary
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