These tiles can be used directly in a drop ceiling application or used as stand-alone on drywall ceiling.  In a drop-in ceiling install I would first glue this to an existing foam panel for additional rigidity.

I ended up using this directly on a drywall ceiling above my bar.  I simply used construction aghesive to attach.  The tricky part is cutting, I used a very fine metal blade on my table saw which worked great.  One might be able to use tin snips but could be difficult to get straight smooth cut.