No need to screw the centers of the sheets.
Just press back firmly onto the glue.
Nailing the center of the sheets can create popped nails after.
If you need to hold back the center of the sheet for some reason, get a 100x100mm block of plasterboard and nail it to the sheet. This pins the sheet back until the glue sets.
After 24hrs remove the block and pull the nail out, patch the nail hole.
The sheet will never move and you will never get a popped nail.
Ceilings can also be done this way to avoid popped nails. You very rarely see it done, but it will eliminate popped nails.
Cheers
Rod
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