Opinions Wanted Hologram mounting

Framing Queen

CGF II, Certified Grumble Framer Level 2
My customer has a large ( 40 x 60) hologram he wants to float on a mat, then framed. It's quite heavy. I thought about epoxy to the mat, but before I attempt that I thought I'd as for some opinions. I've mounted much smaller ones with no issue using the epoxy. THX
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