Surround speaker - In ceiling or in-wall; angled tweeter or not?

A home theater installer put in-ceiling Klipsch speakers in my living room because I won't use floor-standing surround speakers.  Also, I couldn't put surround speakers at the sides of the couch due to furniture placement and opted for installing 2 Klipsch Pro180 RPC LCR (has 45-degree angled tweeters) in the ceiling behind the couch and pointed the tweeters to the listening position.  I have a 5.1.4 system right now with four Dolby atmos speakers in front of the couch using in the ceiling, downward-firing PRO-180 RPC speakers for that duty.

I want to put in "side" speakers to move up to a 7.1.4 system.  Do people recommend front-firing or angled tweeter speakers on the side?  Or other? Also, I can only use in-ceiling to the sides of the couch or in-wall placed high up the wall and near the ceiling.  Any pro recommendations and which way to go?

 FYI - I'm using Cornwall 4's for the left and right and an RP-64 iii for the center.  My living room opens to a kitchen behind the couch, so I can easily place ceiling speakers behind the couch.  Awesome system overall!  Thank you!