throw down a glob of silicone. not positive on the two materials, but if it don't work, 2 seconds with a scraper and you're back to start.
Also, if you go the Gorilla glue route, make sure you clamp it down. The stuff expands as it cures, so your placement, which was perfect before you left it to cure, will be royally stuffed when you come back. PROMISE!
Also, why not try the "metal strap/bracket" on the back (smaller) side and a dab of hot glue on the front?