My BIL purchased a grill that uses infrared emitters, rather
than traditional burners. Like many other grills, the grill
surface was made from enameled cast iron. The grills that
hold the meat were convex on one side and concave on the
other. He said that the proper way to set them in place was
with the concave side UP to trap the grease drippings. I
felt that this was nuts, but the assembly manual with the
grill didn't specify which side should be up.

Whenever I've seen other grills in stores with similar grill
surfaces, they are always installed with the convex side
upward, as I would do if my grill was like that.

Any thoughts on the subject?

Nonnymus