A way to make basegame corkboard snap to each other?

I'm trying to make a large customizable version of the Style-Influencer Trend Board. I will be making some nice postcards and other little trinkets to place unto them. However, I'm having trouble figuring out how to make the corkboards as objects snap to one another (i.e. like how the cabinets and or counters would snap together). Also, is there a way to increase the amount of postcards that can snap to the corkboard itself? Would I have to shrink the postcard's footprint? Or add more rigs to the corkboard?


[this is each image texture file for three different swatches of the corkboard mesh]


[ideally, this is what I want it to look like when snapped together]