Hoss, I know we've all gone techno-geek nowadays, but still butts are done when they're done, regardless of monitoring and internal temps, etc. You dont have to use any, however, that said, I do myself have and on occasion use 2 Maverick's. I think you'll be fine with just 2.
Hance - Lake Dogs Cooking Team - MiM/MBN/GBA CBJ and comp cook
Lake Sinclair, GA (strategically about an hour from everywhere)