You have a valid question. First, the jack stands. Personally, I would recommend using the intended locations. You can accomplish this in two ways. One, put a suitable pipe or rod into the jack point and put the jack stand under the said pipe/rod. The second option is to place the jack stand directly under the jack point, and use a piece of wood between the jack stand and the body of the car. This will spread the load out so that you don't dent in the subframe. Method one would put the load exactly where MB engineers want it, and method two is a little more feasible for those with out a scrap pile. Of course there are other locations one could use, but the methods decribed are the easiest to see/ understand.
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Oh, by the way. The ramps are really designed for front wheel drive vehicles, and instead of the wheels actually gripping the ramps and pulling the car up, you have to rely on the friction between the ramp and the ground to get a rwd car up on them. You could always jack the car up and then use the ramps, but if you've got jack stands thats the way to go.

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