Considering you are using speakers with fixed tweeters (you sure about this, as amazon says it has pivotable tweeter?), it would be better to place the speakers slightly ahead of and slightly behind your sofa / listening position (assigned as top front and top rear).
I presume your side (and rear) speakers are behind the sofa.
Also can't tell from the picture, but your ceiling speakers should be in line with or inside the left and right channels.
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