EE + WP Rocket

Would you still like the code they gave me for you guys?

I am not sure which code you are talking about. If you mean this - https://github.com/maximejobin/rocket-nginx/blob/master/rocket-nginx.conf then it looks nice.

My main reason to avoid most caching plugin is that they generate cached entries using code written in PHP. So this is extra work done by WordPress. While this makes cache generation process more WordPress-aware, I haven't seen any loss of functionality when using cache-generation on Nginx end (--fastcgi or --wpredis options).

Once a page is in the cache, as long as it served via Nginx directly, the site will scale more. Above config does that.

I am mainly interested in testing:

1. Object Cache implementation (currently using wp-redis or redis-cache)
2. CDN Support (currently using nginx subs_filter module or CDN-enabler wp plugin)
3. CSS/JS combine/minify (currently using wp plugin autoptimize)

Regarding caching, I would be mainly checking:

1. What are purge options provided?
2. Does it support cache variation? This is needed when the same URL produces different output based on context such as mobile v/s desktop, country, locale, etc. In such cases, caching each variation is critical. Also critical is to purge all variations when main page/URL gets modified. Both --fastcgi or --wpredis options support caching different variations. --wpredis support purging all variations also.