The cool thing is though you don't have to combine them like that you can seperate the tops from the subs so you can get optimal placement for you towers and get great integration with the subs where they are optimally placed. That's what I've done in my room for mine.
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I have the top tower modules on stands the subs are distributed throughout the room where they measure best
Also those subs are no joke. They can crush a SVS- PB 16 ultra.
But I'm wondering if you had five full range towers like that placed in your room I'm wondering with that much bass placed in that many positions would you be able to cancel out enough room nulls anyway and give good overall frequency response anyway