I've got this in my W220 and it actually works really well and it's a good size. You need to wire it in though, I presume mine was done at factory as the wiring is very well hidden.
It keeps things very cold even when the car is off.
Looks like it, or rather more whether your car has the ski hatch / though load facility.
Quote from the other thread "The problem with the W220 is that the fuel tank is different on a car with a ski bag (or fridge), there is no room for the opening the fridge and ski bag need.
Once the car has a ski bag, installing a fridge is simply detaching the ski bag and installing the fridge to the frame where the ski bag is attached."
I was watching that auction for my Dad's W220. Unfortunately we don't have the ski bag / hatch. So in Dragon's Den style, I'm out....