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I’ve just repaired the same problem. Siemens had used a single self-tapper into a small metal clip at the front of the grill to support the whole grill element front and cover. The clip had complely corroded away, so the self tapper fell out. So you lose the use of an appliance with a single failed screw mount!
There was a 8.2 mm hole where the clip was in the top of the grill area. I found an M5 flanged steel bush and glued it in this hole with JB Weld Extreme Heat “glue”. Its actually a cement, 500deg C rated. I used an M5x 40mm screw to hold it in place, vertically, under pressure from a piece of folded card, while it dried. It needs this pressure because the fibre insulation behind the hole wants to push the bush back out. I left it for an hour to initially harden. I carefully took the screw out then ran the grill at 50deg for 30 mins, then 100deg C, then 150deg to harden off the cement.
After letting the grill cool I reassembled everything with an M5 x 20 mm socket cap screw. You dont have a lot of height in the grill to screw, never mind drill anything. A hex key worked fine. Its all working well now.
