Going a bit further into ceramic on top of PFF...
So, I just got some clarification straight from Gtechniq today regarding ceramic coating on top of PFF. Even though Crystal Serum Ultra (can only be installed by authorized dealer) comes with a 10-year warranty, it is only valid if the coating is topping clearcoat, not PFF. Reason being PFF, by nature, is a loose substrate and will not bond as strongly. He said you could probably get 2 years out of the Ultra coating if kept up with properly on PFF.
They make another product called Halo which is made for PFF, but that will also only last 2 years, after which will need to be reapplied. He mentioned Halo is very easy to apply, and can be done by anyone.
If you have the desire and patience it may be much more prudent to learn how to paint correct the car and DIY ceramic coating with something like Crystal Serum Light. If you can't live with chips, or want the protection, then get just the high impact areas with a focus on the installer to paint correct the whole car so you can DIY coat afterwards.