If the center speaker in question doesn't have a rear port then you can just put it in one of the center compartments of the media unit. But this depends on if the shelf on that stand will fit your center speaker.
You can use taller rubber feet for risers at the front if you want it firing directly at your head.
If your center has a rear port for bass though, you shouldn't enclose it like that, which is when you'd consider a wall bracket or shelf.