I don't think the Fusion FX would be a good band or stage light. Dance floor/DJ light? Yup. Used WITH other stuff to project out from the stage onto the floor or walls or ceiling while the band plays? Sure.
You want something with wash capability for the bands. A couple of Mega Panels would do that pretty good for tight spaces. More mounting options than the Mega Bar 50's.
Oh, if I were you I'd still get the Fusions for sure.