Using Klipsch Heresy 3 as rear channel?

Opinions on using Kilpsch Heresy 3's as rear channel in a 5 channel set up. Everything i've read indicates, rear channels should be at least two feet above ear level. Can the Heresy 3's be used as they are, on the floor for rear channels?  I currently have the Heresy 3's SE for my mains and was thinking of having 5 Heresy's for my HT. I drive the Heresy's with my NAD 758 receiver for HT only. Thanks for any feedback.

Brian