I had one on my 3 door 04 plate. The rear clamp is similar to the front, to fit it you just slide a metal tongue between the window rubber and the bodywork, it’s dead easy.
Fitted mine in 2007 and never removed it til I sold the car 8 years later! Rack was really solid and had no leaks from the clamps going between the door / window seals
Its difficult to get the rubber feet pads so they are completely flat against the roof. This means ( well on mine anyway) that there’s sometimes a slight space at one edge of the foot between rubber and bodywork where road grime and grit will collect so I put some helitape under mine to protect the paint.