"Yeah, I've read that they have a wide (or "big", or something) soundstage, so I always thought that meant I could spend less time worrying about the sweetspot. "
The soundstage will generally be big regardless of placement as long as they are not too close to each other. Imaging focus and detail and bass levels at a variety of listening locations are the things that can reap greater rewards with proper placement. You will generally want to determine the best placement initially from the typical "sweet spot". Once that is done, the resulting soundstage, imaging and coherency should remain in play from most any location.
The soundstage will generally be big regardless of placement as long as they are not too close to each other. Imaging focus and detail and bass levels at a variety of listening locations are the things that can reap greater rewards with proper placement. You will generally want to determine the best placement initially from the typical "sweet spot". Once that is done, the resulting soundstage, imaging and coherency should remain in play from most any location.