My understanding is that plasterboard is attached to wood (or sometimes metal) vertical risers reinforced with cross pieces. The fittings I'm speaking of form a fixing into the voids behind the plasterboard by forming a toggle that spreads the load. If there's a wooden stud at the point you need to fix then you'd use a softwood screw of some description instead.
I wondered if the VESA standard implied a degree of commonality of sizing.
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