Subwoofer height

You know the rel sixpack.
3 subwoofers are stacked.
Rel says each subwoofer has a separate function.
If there are 2 subwoofers, one on the right and one on the left.
What would be the result if we upgraded them to the level of the subwoofer in the middle of the six pack?

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Geddes talks about multiple subwoofer placement where one or two should be elevated and off the floor.

That narration is for the cinema.
I think both should be the same in stereo.