In my opinion, it's really necessary to have a multi shipping method option. This would be useful for your customer to choose a suitable shipping method. In case you do not how-to, we've prepared for you this guide: How to change shipping on your Shopify store?
Hope it helps!
Fast shipping around the world is the best perk a dropshipper will have not only it provides customer satisfaction but also it will generate more customers and sales. That's what we've always do with our partners. We provide fast shipping via private line (7-10 days worldwide) to our partners for them to generate more customers. Please feel free to check our site or contact us directly to know more.