The ceilings the limit.

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I have started looking at the final speaker speaker selection for my setup, so far, 9s front and 6 center, 14/4 bi wired 10 ft and 5 ft respectively. TV/ music 50/50.
Now rears am looking at 7/5/3s but really at a loss for which polk speaker for ceiling I should be using for atmos. Receiver is looking like marantz 6011. Thanks for any suggestions. Am leaning to 5s but 3s might go for the back. Also have parasound amp for 9s which f1 nut suggested I needed more power than receiver had.