Why would you not jack up on the chassis rail, this is the strong part of the chassis, whenever i put a car on the hoist i put the rear pads under the front of the rear subframe mounts and the front pads under the chassis rail near the front.
The only other place to put them is under the seal pannel, this is a ridge near the edge of the car on is where you put the small jack to change a wheel, not big enough are to lift up on the hoist though.