CDN Setup to avoid SEO image ranking loss

Hi, I am using Amazon CDN (S3) and am looking for the best tutorial or instructions on how to set up the CDN settings for Super Cache plugin.

I see that the CDN functions are provided by another plugin (https://www.ads-software.com/plugins/ossdl-cdn-off-linker/) and that this plugin has not been updated in ages, it is not compatible with Amazon S3’s pull method, etc.

I cannot afford to loose organic ranking on images even for a short while, I wonder what is the best way to use the CDN settings page?

Thanks!

https://www.ads-software.com/plugins/wp-super-cache/