You mean in addition to the monitor, or instead of? If the former, it wouldn't be practical because I would have to meet a minimum order for two different BMR's with the same performance characteristics, and then pay more for the tower cabinet and shipping. I would rather save the tower approach for a premium version with deeper bass response and greater power handling. I should be getting a test cabinet for that in a few weeks.
I'm struggling with the depth most speakers regardless of form factor not fitting well. Our living room is 12ftx20ft, so not huge. Due to layout the position of items are pretty much fixed, with the TV and speakers on the long wall. And also the main entrance is by the right speaker. My feeling is a shallow 2 or 'small' 3 way would work well for us. I would still plan to use this with a sub.