Curtain rod hanging - Aussie Zone

Hi all, I have a problem hanging some curtains as there is no stud above the window frame and there is already a blind hung on the frame itself. I could possibly hang it from the ceiling in one room if the boss agrees but the other room has high ceilings. Any suggestions?

Expandable bolts aka moly bolts. Drill a hole, insert the bolt, turn screw to expand the bolt

Or toggle bolts

hgtv.com/…/how-to-use-drywall-anchors--molly-bolt…

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I’m not confident the plasterboard will hold.
they’re designed for it. The toggle action spreads the weight out over a larger area, so they don’t pull through. You can get ones rated up to 20kg
Up to 20kg sold be fine, they are light curtains.