Unless your armrest already has that console in it, you don't want to screw with that. You have to buy an entire new center console / armrest piece, a new duct piece to go under it... not worth it.
There are two P/Ns for the MDI. one ends with an A, the otehr has no letter. One of them is the kit meant to mount in that special center console. The other is the kit for "Retrofitting," and VW intends you to run the wire into the glovebox.
The wire doesn't NEED to go to the glovebox.
My car had the Aux jack in the armrest from the factory. I installed the MDI and tucked the box into the plastic under the ashtray area and actually next to the shifter box/frame. there's enough length on the MDI "extension cable" to make it into the armrest from there. You'll need to trim a little bit of a hole next to the Aux, but it only needs to be big enough for the cable itself to fit in and then you can squeeze the head through there. My MDI jack is just hanging out in the armrest and I plug stuff in there.
The MDI is the same kit for RNS510 and RCD510/"PRemium 8."