None of these dealer offered paint protection packages are worth the money. If you want a simple and cost effetive paint protection, put on a couple of coats of Sonax PNS (£14 from amazon) when you first get your car after a good clean. Good thing with it, you can put it on the plastic parts too. Has no residue and goes on a bit like Mr Sheen. Spray on, wipe off. If you top up with Sonax BSD every few washes, then it will last for a long time. I normally get 2years out of it, with regular use of BSD, before I see a noticeable deterioration of water beading.
A can is enough to do 3 cars.