I needed a way to hang this wire basket (made of 4.5mm thick wire) on a multiboard tile. I hang 3 of these to hold a basket of around 1.5kg.

Print in the orientation as shown with supports. I tried printing it on its side but it broke more easily.

To keep it screwed in tight at the right orientation, use a Big Thread Hole Nut. Screw the nut all the way onto the thread, then screw the hook onto the tile. Once it's in almost all the way, put it in the right orientation and unscrew the nut to tighten it against the tile. I tightened the 4mm nut I linked by hand but next time I'd probably go with the 8mm which might be easier to grip or use a wrench with... (or maybe you can remix the hook to cut the corners a bit for access.)