Nay, some zoa will out complete single polyp if they take over the frag. And it’s harder for buyer to cut them if they decided to frag them. But if it’s for your own entertainment view. Go for it. It looks good so far.
I like the thought. I've done something similar on a larger rock as Ashburn2k said, some out-compete for space. I placed some smaller polyps on the same rock as some larger ones that now, keep the smaller ones in shadow. Keep away from that trap and this will look great.