You're asking the wrong question. Even if you do manage to get that 1 page ranking, it can't rank for more than a handful of keywords. You need to come up with

You're asking the wrong question. Even if you do manage to get that 1 page ranking, it can't rank for more than a handful of keywords. You need to come up with some content: blog posts, videos, interviews, anything related to your app and funnel those visitors to users. Aka content marketing.