I owned the Raidho X-1s for a stretch. They are amazing when listened to at a distance, spaced 9’ apart and with 2-3 feet of clearance behind them. If setup isn’t perfect, they are not a special speaker. Just because a speaker is not rear ported does not mean distance to back wall is irrelevant.
What is your projected distance behind the speakers? What about spacing between them?
What is your projected distance behind the speakers? What about spacing between them?