Why? Replace your 7.1 receiver with an (overpriced) Atmos receiver and you're done.
So, let's see if I have this right. Atmos installations in a theater use a matrix of ceiling speakers to achieve their (in my mind questionable) effect. Now, we're being told that 2 speakers can imitate that effect in your home. Oh, and we'll just subtract the side channels from your current setup and replace them with these special ceiling bouncers. So, instead of two side speakers (which are often mounted high anyway) we've got 2 Atmos channels that fill in the center of the sound field by bouncing the sound high.