You don't have to install caching plugins along with our CDN's inbuilt caching system. We take care of every caching aspects and such that you don't have to use any caching plugins like W3Total Cache or anything similar on your WordPress website.
You can always use plugins to compress images and smush them for improvising the performance of your website. But that's completely optional.
Using Caching plugins at WordPress level and enabling our CDN's caching might introduce you to critical website problems. Please don't use both at the same time. Use either a plugin or our CDN's caching system, one at a time to avoid conflicts.