zip fix plasterboard fixings are one of the best fixings available for fixing to plasterboard or drywall, they are inexpensive, easy to use and can hold a decent amount of weight. Originally these were known as Snap toggles, but the Zip fix fixings are identical. These are my number one choice for fixing to plasterboard, if I can’t locate a suitable stud to fix to.
Snap-toggle video here- https://www.youtube.com/watch?v=tAIUublenMw&t
Plasterboard weight test video including the snap toggle (zip fix) https://www.youtube.com/watch?v=ECDysfNhx_E
Fixing heavy items to drywall/plasterboard- https://www.youtube.com/watch?v=glzwY76O0d8
Zip fix on ebay- https://fave.co/2VWxovO