You don’t need to buy paid plugins for this, because there are many free. One of such free plugin is WordPress Social login
Just enable and set configuration for buttons. You don’t need to connect user profiles with social login, because I already made this (for Ultimate Member login and register pages and for default login/register popup of theme).
Social login plugin is a bit outdated now, so, if you want to use any of other social login plugins, you can add shortcode of plugin to Theme option – user option – Add custom message. You can find social login plugin in wordpress repository