12 - 15 lb flats? I have trouble finding 12 - 15 lb packers at times!
A big flat should cook just fine. I do mine fat down since the heat source in my FEC is from below. If you are worried about it drying out, you can inject it or cover it with bacon.
"Ron Rico, Boss. You can call me Captain Ron..."
The Naked Fatty!
FEC-100/BWS Party/Memphis Pro SS/PBC/LBGE X 2/SBGE/Mini BGE/Nomad Pellet-matic/Good-One Model 42/WSM X 2/Cookshack Smokette 008/Weber Performer/Saber Cast 500/Weber Gasser (RIP)/Weber Kettle X 2/Weber Smokey Joe/WGA/UDS/Coffee Roasting Gasser and a pickle
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