I wax loads of guys and I rarely use hot wax on the back.........but I always use hot wax on their neck.
It's become very 'good wax' (hot) and 'bad wax' (strip) which is a shame. Strip wax is amazing but only on less sensitive body parts and on finer hair. When you wax men, you'll find that you use mainly strip wax whereas when you wax woman you use mainly hot wax. This os mainly because the body parts that they have waxed vary.
It you want to offer hot wax as an option, keep in mind that it will cost you a hell of a lot more and it will take you much longer too so have the two prices on your list. Most salons charge from 60% to 100% more for using just hot wax. So from a business point of view, strip wax for a back is the best option for cost and speed.