gluing/grouting tile to tile

south central, WI(Zone 5a)

Hello, I have 4" square tiles that I would like to make into plant markers or outdoor decoration for my sister. The front one would be those that have been decorated at the factory.
I would be adding 14 gauge wire for stakes.
Could I glue them together and maybe run a bead of caulk or fill around the edges to keep dirt from edging in? or do I need to put them on a solid surface.?
Any help appreciated.
Marcia

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