how did you get your pc status? If you get it the normal way you should have an idea that there’s never such a thing called confirmed upgrade at hertz hle. Hertz only has Niro, Ionia, fusion and mkz and possibly still some Prius left for E6 and all of them being extremely rare. Your chance to get one even you book it is close to 0 let alone a free upgrade

however according to hertz all SUVs such as kicks and ecosports are considered upgrade even for F so you might get one of that, there’re tons of these