There are different versions with that stem and flower scheme/color that do all of what you said. Without knowing exactly what they are it's a crapshoot as to which eventual size. For 3-5' you'd be looking at Little Quick Fire or Fire & Ice, something along those lines. The larger one is regular Quick Fire.

At any time you can trim the taller portions down to make more uniform shrubs (Paniculatas often don't grow uniformly; they'll send up big new stems at random each season). If one of those big random stems goes past 6' I would highly suspect Quick Fire, in which case you may want to move them before they get too large.