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jup, that makes sense. No idea where the studs are? how is the ceiling built up?
If you really want to be sure I'd make a hole a bit smaller than the ceiling rose, insert a wooden plank that's bigger than the hole, two drywall screws to secure it in place, and screw the hook in there. A bit like this: https://dadand.com/reinforcing-drywall-to-mount-stuff-or-fixing-drywall/
If you can still move the electricity you can find the studs with a strong magnet.
mtsdw
I have used those, my concern is that the load on those is parallel to the sheet, at 90 degrees to the axis of the fastener.
In my application the load path is inline with said axis- and would be attempting to pull the fastener out of the board rather than through it, if that makes sense?