It depends on what kind of ground effects. My complete Vanacor ground effects let the jacking spots be accessible. With my new Greenwood ground effects, plus having it lowered, makes it impossible. I have to start out with a sissor jack under the front motor mount, and inch it up so I can get my trolley jacks under the sides. I pray I never get a flat!
I have the Greenwood kit like Barbie's. Her car must be lower than mine tho, as I have a low profile hydraulic jack that will still fit under and reach the jack points. Like Barbie said tho, still would'nt want to get a flat, the jack does'nt fit in the car.