Hi,

I'm about to book a medium-size car rental for (mostly consecutive) 60 days near SFO, paid by me but reimbursed by an employer

This makes it an interesting opportunity to gain some benefits - points/miles/statuses - derived from this rental. I would appreciate your experience advice on how to do so!

I'm working on my status with UA, so I would prefer crediting any miles there. I don't mind splitting the rental periods with 2 or even 3 companies if that can help maximizing benefits.
Current rental companies statuses: Hertz Five Star, National Executive
Current CC: Amex - SPG, Plat, Chase - Sapphire, United Explorer

Thanks in advance fr any creative ideas!