Another method is partial repetition of the rack. You can do without it, but it will not be as effective. To work in a power rack I admit only athletes who have reached significant scale in conventional rods rod in the slope.
So stoppers frame set at a level just above the knees. Technique such as when the rod pulls the floor, Is This Program a Kyle Leon Scam? but since the amplitude of movement is shorter working weight increase. Again, do not let go for the neck stops and do not let the parade.
After completing the movement, pause and proceed to the next repetition. Jerk and pull wide grip are also great exercises for mid-back. You yourself will understand it by looking at the simulations weightlifters who work in these movements over and over.
Since your pelvis and hips are below the neck, you load the middle of the back muscles a little differently than when it pulls in the slope, and the variability is always helpful.
All rods - a slope, in a power rack and jerk rods - stick to the scheme 5x5. If I notice that the rods in the slope of the athlete is hard to keep a straight back, I switch it on exercises used rowers. They go forward on a special high bench and took off the neck of the stops on the outstretched arm, pull over.