Help No corners for my Klipschorns

First and foremost I would like to thank anyone that takes the time to read this and any help is greatly appreciated. I am in the process of building a home theater and I want to use my K-Horns up front along with either a Lascala or a Belle for a center channel. My problem is I don't have any corners for the K-Horns!!! I did read an article a while back where K-Horn owners actually built walls right to the speaker itself. Anyone that has experience with this type of application could you please let me know if it worked for you and what kind of material would you recommend for the best possible sound. Also how much sound quality am I sacrificing?
Thanx
Eddie