Really Simple SSL Pro automatically detects your settings and configures your website to run over https.
To keep it lightweight, the options are kept to a minimum. The entire site will move to SSL. Includes premium features:

• Extensive scan which enables you to detect the source of mixed content that couldn’t be fixed automatically, with fix button
• HttpOnly and secure flags to make cookies secure/encrypted
• Improve security by enabling HTTP Strict Transport Security for your site
• Mixed content fixer for the back-end
• Submit your site to the HSTS preload list
• Easy implementable security headers: X-Content-Type-Options, X-XSS-Protection, X-Frame-Options, Expect-CT, Certificate Transparency, No Referrer When Downgrade header, Content Security Policy, Upgrade Insecure requests.