I have heard a few sound bars and never heard convincing surround sound from any of them. The pro configured one created some half convincing surround sounds but I felt I had to strain to get them imaged in my brain. I don't want to strain when watching a movie.

In short, in wall would be better but in ceiling would be a better compromise than a bar.

My own, non professional, opinion, of course.

With great power comes Awesome irresponsibility.