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i haven't seen anyone put jackstand under axle.
all the shops i work with put the stand under jack pads.
The "jack-stand under axle" support pertains only to fixed axle (aka "live beam") suspension ... not to any Porsche or any car with independent suspension.
The jack stands must be as low as possible and as wide and squarely far apart as possible using chassis points designed to hold the full weight of the car with careful attention to the center of gravity especially when removing wheels or the engine, transmission, etc.