If your website server is located in New Zealand but have customers all over the world then CDN can help. In simple words, a content delivery network (CDN) is network of data centers all over the world. Your website is served to your visitors from data centers close them, resulting in faster load times and availability.
If you have customers/visitors outside your geographical location then yes, it is strongly recommended. Websites such as online stores, blogs, online courses, membership sites with visitors from all around world can hugely benefit from CDN. If your visitors are from New Zealand and have a reliable server based in NZ (or across the ditch) with little traffic every month, you may not need a CDN.
Premium CDN offers better performance and availability where you cannot expect much from a free service.
We certainly can. Please contact support if you are on Personal plan and would like us to setup free CDN (with Cloudflare) for you.