Just one mining bot as I have a good PC, for the beginning it's enough. But I plan to run more.
And as for the latest news, Utopia p2p is already available on android: https://medium.com/@utopiap2p/beta-version-of-utopia-p2p-mobile-app-has-been-released-31ef9cc7bfbb It's been a long time they promised to release a mobile version and this day had come already. Ofc it's a beta version now.