if you're fitting rear suspension, you will want to support your car on the body, not the rear beam.
because when you remove the struts, the car will fall on it's arse.
behind the rear jacking point cover is a square section - perfect for axle stands
at the front, you don't want to support the subframe, since you'll be needing to lower it - you'll need to support it elsewhere (I use the sills with a block of wood with a cut out)