These shrubs seem to look best (and are most often used) in group plantings - usually as hedge bushes. More is better for visual impact. However you can always grow a single plant as an accent or even as a specimen plant or small tree (it can get 15 feet).
If left untrimmed, the plant will produce little white spring flowers with a sweet scent similar to orange blossoms. Most people don't realize this shrub even flowers because it's usually kept regularly trimmed, and the flowers themselves are small. This plant grows too large eventually to work as a foundation shrub, especially under low windows.