I jack under the front chassis "T" section. I use a low profile jack and a thin piece of wood. After it is in the air, I place jack stands at the outer parts off the "T" section. At the rear I jack on the chassis tube that supports the transaxle mount. I use this set-up for jack stands at the rear:
I will sometimes also use ramps under the wheels as jack stands, very secure that way.
Never, never, never go under a vehicle that is just supported by a jack, or multiple jacks. It has to be properly supported by jack stands to be safe.
Do not place jack stands under the rear radius arms. There are just box-sectioned, sheet steel and are easily deformed.
Lotuses are LIGHT. This makes them especially dangerous as they are easily knocked off even secure jack stands. Be careful as you try to lift or pry things while under the car. You may accidentally knock it off the stands. This happened to my friend as he tried to wiggle a rad back into his 70's Elite. They found him dead several days later as his dog was howling from inside the house.