Correct orientation of tube traps is essential to proper spectral balance. In my room with my summer setup, the traps on the front wall corners have the dot of the reflective side pointing directly at the listening seat. The tube traps for the rear wall corners have the dot facing forward and angled in at the intersection to the wall. I have a mixture of corner tunes and wall mounted bass traps plus absorbing panels. As with most things, if a small amount is good, a whole lot more is usually not better.