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If that was my job I would screw and glue 3/4" ply to studs screwed @ 8" on center. pre drill ply so as to suck up to studs. Then poly down to pan and cbu install per instructions over that. I would not worry about screws through poly. Make sure to hold the ply about 2 in. above the pan and run the cbu just short of the pan.
Just the way I would do it. Im sure others have many more ideas that would work as well.
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