Better Crafts Round Wooden Plaque, Perfect as a Wood Base for Craft Projects! 4 Inch (Pack of 2)

Here’s another option: buy a couple of these wooden bases, or something like them. Decorate to taste. Drill a pilot hole in the center. Attach sun and moon to wooden bases. Attach wooden bases to wall using wood screws that are long enough to attach firmly to studs. https://www.walmart.com/ip/649539956?sid=CDAE781B-7CB7-464C-92C5-A317B6578B6C