I recently bought a new Nismo and had the front of the car, roof and side skirts wrapped in Xpel PPF prior to leaving the dealership. I thibk it’s well worth the £1200 or so on a brand new car.
With regards to the alcantara, treated my alcantara Seats with GTechniq I1 smart fabric. Can be bought online, spray it on leave to dry and then spray again for the second time. Job done, may require a reapplication after 12months.
As previously mentioned make sure the dealer removes the transit blocks on the springs and try and get them to do a full 4 wheel alignment check on the car as some of my settings including castor angle were outside tolerance. Nissan HPC are adjusting mine next week.
Enjoy the car