really need some help!

I have a 2.2m long 7ft projector screen around 10kg / 22 lbs. I need to hang from a hollow wall WITHOUT JOISTS.

Bit annoying, but I've got a stud detector and defo no wooden joists in this ceiling. Seems to be suspeded on these thing I imagine as lots of metal detected <https://gmceilings.co.uk/mf-ceiling-taunton-somerset/>

I've got two of these - they say they are rated for 25KG <https://www.amazon.co.uk/gp/product/B01AK6UO2C/ref=ppx_yo_dt_b_asin_title_o00_s01?ie=UTF8&psc=1> but I'm not so sure.

The plan is to hang the screen on these as needed (not permanently up).

The Ceiling is half inch thick.

I need it abou 12" from the wall or I would just affix to corner.

Thanks!

-Peter