I've actually found that the mic and the auto-eq feature work exceptionally well. You don't need to seal off the room or barricade yourself, simply don't stand between the speakers and the mic. As far as finding something to set it up on, try a simple camera tripod...the mic is fitted with the female threading for the universal camera mount and with a tripod you can adjust the height and maybe even set it up solidly on your couch where you actually sit. This isn't brain surgery...
As far as the measurements, the mic located my speakers within 2" of their actual locations. The only challenge that people seem to have is that it places the subwoofer farther away than it should be...but that's easily fixed by going in and adjusting the parameters. For $65 it does much more than a Rat Shack SPL in that it actually compensates for room characteristics, speaker frequency response, and distance and leaves all of the results easily modifiable. Additionally, it's easy as hell to use and pretty quick, too!
Jason