Traction is in the rear most of the time, which would mean, its always in the rear on pavement roads due to 2WD mode. Thus, i'd put the new ones in the rear. Front only gets torque when in 4WD.
Traction when turning is kind of nullified when the ones on the rear have 100% torque on the road. You certainly dont want the rears to lose traction/skid accelerating when wet, otherwise you can get a nice oversteer and drift on. Fronts dont skid.
If it were a front wheel drive car, that would be different, as you would be accelerating with the fronts. But the JK is a rear wheel drive most of the time. If it were AWD, i'd put one on opposing corners XD