I hadn't heard of that sub. For the sake of everyone else who isn't familiar with it, here is the manufacturer's description (google is our friend!): "Dual 8" woofers are mounted inside the 10" round by 10" deep durable steel enclosure designed to fit even in the first floor ceiling of a two story house." Looks like it is intended to be used with a rack-mounted 1000 watt amp.
Even though the unit uses "dual 8" woofers," only one woofer actually radiates into the room. An 8" woofer can only move so much air, even with 1000 watts behind it. If your budget allows, I think you would be better off using two.
Putting one sub at the center of each of the long walls might produce smoother bass response. Putting the subs in corners would produce more output, but likely not as smooth.