The place you saw them won't always be the place they will be in the spring. This area will be a starting point though. I am sure you know but right now the turkeys are in a winter pattern/group. They will intermingle and be in large groups of 50 or more (depending on the area and the population of course numbers could be higher or much lower) In the spring they start breaking up into breeding groups hens in one and Toms in other. they will even break down in smaller groups or singles too. They can sometimes roost together- depends on the trees they have, but in TN I'd say they might be spread out a bit more, just because you have so many trees and cover there. So the long answer is maybe I'd start there and put some trail cams up and see what there is to see. Also if they are there look for landing areas and set up about 100yds from the roost. You can get closer depending on the cover you have but the danger of setting up too close is busting them on the roost and when you do that the first time it will startle you! I promise that!