Hi Sherman,
I used to lift the rear of the car on the gearbox with a wooden load spreader on the jack, but no longer do so, these days I lift off the rear hoop. The reason I stopped doing so was because lifting that way puts the weight of the car on to the engine/gearbox mounts so I figured I was overloading them. No idea if that's a valid concern or not, but it was enough for me to change my habits.
I do use the rear frame legs for the axle stands as in the photo but I have some very large axle stands, much longer & heavier than standard and designed for higher lifts than normal. If you were using conventional stands I think you'd need to have them on some sort of platform support to get the height.
Having said that, supporting under the rear chassis legs makes for a very stable car with plenty of room to move about.
Brian