The RR2150 will drive towers or bookshelves equally well. It does have the subwoofer output should you choose to use it, but it does not depend on it.

You could always take advantage of the 30-day trial and just be out shipping should you choose to return it.
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975/7075/SMS-1
Aperion Verus Grand Towers & Bookshelves, Verus Forte Center, Infinity Surrounds, Ultra-X12
Oppo BDP-203, XBOX360, Xbox One
LG 65" OLED
RR2150 w/Klipsch SCR-2