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The low-slope panels we've seen all have hidden fasteners or hidden clips, and designed to prevent water from getting past the joints to where the fasteners attach the panels to the roof. If the panels are screwed through the surface that is exposed to the weather, then they are steep-roof material.
In a low-slope application, you have to expect that there will be an accumulation of snow on the surface, which can then be saturated by water. This then creates hydrostatic pressure which allows the water to push into any open holes or joints. Low-slope materials are designed to prevent such water from entering the area where the panels are fastened.
Hope that makes things clear.