They can be used both as front speakers or centre speaker together with most DLS Flatbox models. 
The flat design makes them fit perfectly as a centre speaker.
The front grille is attached with strong invisible magnets.
Both a white and a black front grille is included. Also available in black high gloss finish.

All Flatbox speaker models can be bought separate for use as centre speaker in surround systems. There are key hole mounts on the rear for both horizontal and vertical mount.