Placement of KEF R8 Meta

I’m looking for advice on the best way to position my two sets of KEF R8 Meta speakers. I’m using them for front and rear height channels.

Should I: 1. Place the R8 Metas on top of my front and rear speakers (R11 Meta and R3 Meta respectively) to use them in up-firing mode?

2.	Or wall-mount them above the front and rear speakers, angled down toward the listening position?

This is a 7.2.4 setup with ceiling height of 8 ft. Room will be acoustically treated and I’m using a Denon X4800H. I want to make sure I’m getting the most immersive experience, especially since I’m investing in proper height channels.

Would love to hear what’s worked best for you all.