Suggestion no. 1: if it is feasible, begin from scratch
Now, preferably, you gave some thought to the room in which said speakers will go before you bought your speakers . but we are going to risk a guess and state that the 7.1.2 setup might not need been towards the top of your brain whenever establishing your family area.
That is completely fine. We could make use of that, however it could provide a couple of niggles.
The scientific-back advantage behind establishing an area up from scratch is, when correctly put up, sound waves will not travel far or mirror off of whatever areas they arrive into connection with. The greater amount of reflective the top, the more the bounce. That is why the acoustics of the available space impact exactly exactly how music and movie noise.