XNV and XLS are not yet mineable on the platform. Coins that can be mined on the platform at the moment, have a Start Mining button next to them - https://www.hostero.eu/cpu-mineable-coins. Hostero is essentially a wrapper, it runs the official miner of the coins, in a Docker container.

Banano is not mineable like the rest of the coins from the list (with a POW algo), however it uses a similar principle, renting CPU power for rewards.