Pvc panels for ceiling

[Tennentslager]

Got a little mould (small and can paint over every year or so) but thinking of fitting the pvc slats.

It's on plasterboard ceiling do I need to strap it or is it clips or adhesive?

Also where would you buy this folks, it's a small room 2m by 2m roughly.

Finally, it's already tiled so would you recommend a trim for the edges or a sealant.

Thanks