Are in-ceiling Kef Ci160ER speakers okay for large living room (5.1.2 setup)?

All 7 going with Ci160ER for clean look. w/any decent sub and Denon 2800. If not required downsize to 1700.

Budget flexible but looking for aesthetic look. Prefer the sound of 650c but afraid it will look too bulky. Typically watch movies and tv shows.