1) and 2) are very flexible. They can sit close to both the back and sidewalls without issue.OK, since you're a dealer, may I ask: What are the minimum recommended distances:
1) side-wall to the speaker
2) back-wall to the speaker
3) in-between speakers
4) listening position (to speakers)
Thanks!
3) and 4) will be somewhat related for a balanced presentation. 4) is a critical measurement with any horn loudspeaker system; with the Wagner II I find about 6.5 feet (2 meters) or greater works well.
Generally, the Wagner is designed for real-world rooms and I think you'd find it works quite well in yours.