I'm thinking a wood strip 1 by 3 and 4 finish nails, mount it vertically? two screws to hold hopefully to a stud in the wall.
I've been getting quizzed on casting imperfections. I've never seen in person a molding line. But I've figured 2 different problems they fixed. Inclusions in parts and parts being out of spec. My answer was look for holes in the sand screens, yep replaced that. Some place in the machine it has a flat surface for the match plate is worn. Yep they replaced that and back in specs again. I've done a lot of sand casting, but it's almost all done by hand. Same rules apply!