Yep, they want not only a legal opinion regarding the US securities laws, but also "legal opinion letter from a Maltese law firm confirming that the token is a Virtual Financial Asset (VFA) and not a financial instrument". Which at the surface level seems a bit confusing, because if it's not a financial instrument nor a security, then what is it. I'm no lawyer though, so there may be a more nuanced answer for these questions. Many of our top picks, including: Bittrex, Binance, Kucoin, Poloniex, Kraken, all ask for a US securities legal opinion. We are working on it and so far the discussion with legal seems pretty positive, but we have to wait and see.
A couple of other options could be: Bibox, Upbit, Digifinex, Gate.io, Lbank, and as you suggested LAToken. Many of those do not ask for a legal opinion, have decent volume for a variety of coins, and at least a good deal of traffic.