I think you are better of with flotation triangles and clips or to at least hold the mirror with a ring of silicon at the support zone . I can't see how the mirror can float properly on the supports when it is held from the edge like that. It would always be hanging somewhat from the edge. Mirror cells for large telescopes go to all sorts of lengths ( ie roller bearings , slings , teflon pads ) to stop a mirror hanging on its edge support.
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