I use my own ingenious film dryer:
Wit hsome other equipment I got a large number of very strong steel clips, with a gripping edge about 7cm (3 in) long. I unwound a wire coathanger, slipped 12 of these on the wire, and rewound it.
The hanger then takes 12 4x5", or 6 5x7", or 4 8x10" without any danger of contact. The 4x5" ones I clip by a corner, the larger ones by the short side less than 1 mm from the edge.