Wow! This "ACE American Insurance Company" looks like one big monopoly. It seems that most (if non all) US-based car rental companies use them as underwriters on their TPL (SLI, SLP, API, RLP or whatever else they call it) policies. Yet, this company does not even have a website (I googled). It looks like they do not want to deal with the general public. But, sure enough, they try to overcharge people at the rental counter:

https://www.law360.com/articles/8506...-customers-say

So, is that it? I mean, is there ACE's monopoly in the US's rental car world with no other place to buy the TPL?