Case has it right. Silicone will hold the mirror better than any sort of tabs. Just design your frame so that you've got enough frame/mirror overlap (say at least 1/4") then put a small bead of silicone on the very edge of the mirror and "set". That's how we would've done it in the glass shop I worked in anyway. Let it cure overnight and voila! You're good to go.
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The Fire is King.
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