wordpress plugin

I am using free version of Redis Object Cache free plugin but I see that they are offering paid version of this plugin, not sure it is better than free or not. Did anyone use Redis Object Cache Pro WordPress plugin, pls give me any advice?

Do we need to install AMP WordPress Plugin? is it necessary to install this plugin? I read that it help to improve loading speed on mobile website but I am having this iusse when it auto added to url of my Wordpress post like this example.com/this-is-post-title/?amp=1 this make it duplicated...

Any WP plugin to switch the users on different page based on their country.