Facebook unfortunately does not allow third-party apps to be added anywhere other than in their own tab. This is what your POWR app will look like on your Facebook Page:
Not possible yet 😥
Mobile: For security reasons, Facebook does not display third-party apps in the mobile version of Facebook.
Wall / Cover Area / Default tabs: Adding apps to the top of your Facebook Wall, within other default tabs, or anywhere else on a Page is unfortunately not possible at this time.
As soon as Facebook does allow app developers to create apps for those areas, we will make the necessary updates on our end to make this happen.