Honest question, how did you know about PlatePass if you didn't receive information about it?
Also, doesn't every Hertz vehicle now have a sticker in the upper left of the windshield regarding platepass, EZ-Pass, etc?
If you were concerned with fees, just physically pay the toll. I just did this on my trip to Florida. I had the vehicle 10-days and needed to use the toll road only on day 1 and day 10. I was not going to incur a $4.95 fee per day ($50), just to have the "privelidge" of using their tollpass.
It seems like you know about the tollpass, so pay it and move along.