I have a 5 door and have a thule system with the alloy aero bars (silver, sleeker and quiet) All with locks ---Not OME, but thule's own system
I carry 3 bikes (2 adults and 1 childs) using the thule 591 cycle racks, same racks fit on our Audi Avant so its nice and easy. Tend to use it all more on the audi as it does dent mpg, but if you are carrying bikes they are secure and out of the way, and you get easy access to the boot at all times which is essential, quick and easy to fit and take off, just watch the paintwork, make sure the car is clean
I got the bars, foot packs and rapid fitting kit all 2nd hand on ebay and got a good deal. It wasnt a complete set up I got them via 3 seperate sales and sold on the bits i didn't need. It worked out the cheapest way for me
Had the same make on my old Mk4 with no issues, take a look at the thule website