Welcome @hondaron , I have a 9.2.7 immersive audio setup you can check out in my virtual system. Upgrading your Blueray to an Apple streamer for movies is going backward. Discs are the higher level source. Upgrading to an Apple streamer for Apple Spatial Audio (atmos music) is a must. You have already done the heavy lifting and got your equipment.
There is ONE thing you should do now while your amp is still breaking in. Checkout my thread on setting up your room for Atmos, the Dolby specs contain angles to place your speakers. Follow the bed channels to the letter. The height channels we can discuss depending on your room. Next steip is post your system and pics if you can in your profile "Virtual System" page and we will get you to where you wanna be. Enjoy.