WP-Smooth-Scroll is a plugin that helps users to scroll smoothly to top of the page.
A. Yes it is can be used both in posts and pages.
A. As we dont need smooth scroll to top option in tablet or mobile phones, this plugin will automatically hide in these small screen devices.
A. You can select any position from Bottom-Right, Bottom-Middle or Bottom-Left as your wish. By default it is Bottom-Right.