In-Wall Surrounds : Installation Height

the crutchfield says 1-2 feet above ear level.  I assume that is a sitting ear level.  Thanks Monkey i think that's what we will target.

Yes, in both instances I managed to end up with the middle of a dipolar array of tweeters falling at 24" from the ceiling, and 24" from ear level. However with your Paradigm CI Elite E80-IW surrounds being monopole this should also translate.

About a foot or two MAX above ear level.  Especially if you plan on doing any Atmos height speakers as well.

I have a 5.1.4 in-wall system all Bowers & Wilkins speakers and I have my tweeters to both front LCR and surrounds at ear level and it sounds great.  If you plan on doing Atmos in the white paper posted on Dolby website it says tweeters should be at ear level unless you have multiple rows with a raiser than a foot higher to compensate for.