Planting fig trees in the ground, in Zone-7.... is ALWAYS going to be a gamble. Fig trees evolved in Mediterranean climates, and will not do well in Temperate climates, i.e. unless they are protected from freezing temperatures. You may think that your climate, or local winters are mild enough, but all it takes is one bad, freezing, winter, and your trees are done. Fig trees are semi-succulents and must be treated accordingly, or new growth will be damaged from freezing if not properly hardened off. Many forum members growing in ground, and located in Zone-7, have lost many fig trees and in some cases, whole collections have been wiped out, over the last few, terribly cold, winters. BTW....fig trees do not need a "chill effect" to grow figs.
Posted on this forum are many suggestions regarding the winter protection of fig trees. Personally, I would NOT plant young trees into the ground, given your climate, but instead, I'd containerize them, and store them in a cool garage. If possible, keep the young trees cool enough to stay dormant, but just warm enough to prevent freezing. Also, keep the root-ball hydrated and damp.
Good luck with your new trees.
Frank