If you want to do front and rear speakers then you will need to purchase 2x of the IS VW 155 sets (which will be 4x mid range speakers and 4x tweeters in total). This is what I had in my car.
And yes I installed sound deadening extensively when replacing the speakers (as well as doing the rear hatch, spare wheel area and under the rear seat) but I didn't use the Focal sound deadening - I used this product which I was happy with:
BIG DOG SOUND DEADENING ROLL
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