Do not use a blocking modal. Ever. Gracefully insert it so the user can finish whatever they were doing, but still see your prompt. So a banner that slides in b

Do not use a blocking modal. Ever. Gracefully insert it so the user can finish whatever they were doing, but still see your prompt. So a banner that slides in below the title, or at the bottom, etc. It is not overlaid. And can be dismissed at any time. That way, the request for feedback itself is not a negative, jarring experience. This is what I did on https://www.joyapp.com https://www.joyapp.com and had very positive results.