leanne (and anyone ) i emailed alamo (we were going to use them, probably not now but we are still kind of undecided haha, day to day!) and they wrote back and said:
Thank you for contacting Alamo Rent A Car.
That price does not include the Personal Liability Insurance. In Mexico, PLI is mandatory at a cost of $10 per day. Liability coverage of up to $75,000 applies to all accident related expenses not pertaining to the rental vehicle. If your rental company will cover you in Mexico, we would require letterhead from that company, with contact information, in order to have this charge not added to your bill.
Thank you,
Chris
Help Desk
Alamo Rent A Car
FYI this is alamo, idk if it is EXACTLY the same at all car rental agencies in MX, or just alamo's policy (the PLI thing, who's policy, alamo or MX?) anyways, i just thought i'd share