Not checking Preev rates for I think almost a year now also because of that few supported coins.
As an alternative and saw the improvement of this site as it progress, I refer to
Coingecko for coin pricing now. It looks like a modified version of how Coinmarketcap viewed a coin but with a USD converter.
Honestly, probably I have never used Preev for other currencies than Bitcoin. When I need to convert other cryptocurrencies, I simply enter something like "Monero to EUR" or similar on Google and go to first website shown in search results.
That's how I end up in Coingecko back then until now.