I'm going to throw up a baby Advent I have laying around as a rear surround. It seems to sound pretty good for what it is, however, I would start with a stereo mix done on monitors, then create the surround panning.
Those small guys don't have much bass though, I will probably rolloff at 100Hz for the surround speaker (not in the final mix though). So I think it would be tricky if those were your mains.