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 darn near anywhere)
Started competing in chili cookoffs back in the 1990's and have competed in more than I care to count. I became a CBJ in MiM in 2005, then MBN and in GBA in 2010. I've probably judged 130+- BBQ comps (sanctioned and unsanctioned) over this time. That said, I really enjoy competing more than I enjoy judging, and hope to get back to doing 4 or 5 a year in the near future.