I wonder if you could sandwich mlv between the two sheets of drywall as opposed to using green glue. It would be easier to hang if you could attach it to the second sheet of drywall on the ground.
LFR1100 VP180HP EP600 M3 In Ceiling x 4 M5OW M2 - Atmos rears ADA1500.5 M3 Outdoor Speakers ADA 1000.8