This has only been tested with the master replicas small version of the U.S.S. Titan. This is a 2 piece bracket meant to allow the clear section of the ship stand to be attached to the underside of a metal shelf with magnets.  Cutouts are meant to fit 12mm x 3mm sized magnets.

Brace crossbar should be glued to base part- this was modeled with a 0.1mm margin for fit. Freecad file included in case you want to make your own changes.

Example printed at 0.2mm layer height with form futura white aluminum PLA.