This will let you rack up multiple shoes over each other on a multiboard.

It requires a fairly large printer bed (~300mm). It also has a multiboard tile distance of 11. So a single 8x8 board won't be enough to support it.

You'll need to fix snaps to the back with a thread bolt: https://thangs.com/designer/Multiboard/3d-model/Small%20Thread%20-%20Lite%20Multipoint-1123321

I recommend using heavy-weight bearing for top snaps: https://thangs.com/designer/Multiboard/3d-model/Heavy%20Weight-Bearing%20Hook%20Snap-1130430

And regular for bottom snaps: https://thangs.com/designer/Multiboard/3d-model/Multiboard%20Snap-974295 

Recommend printing upside down, with supporting the snap-locks.

Technically it might be possible to print without support, standing everything on the narrow chamfer at the front. Given your bed have enough adhesion during print.