This app looked good at first and seemed to work well, however after digging deeper there has been multiple issues, and support has been little to no help unfortunately. The app does not support shipping rates, and will attempt to use Shopify rates, however will ignore the conditions to those rates. If you have a free shipping over X amount requirement, the app will give free shipping to anyone. After speaking with their support team, they mentioned they have no plans to fix this issue, and have since removed the live chat functionality from the app dashboard which seems strange. The app dashboard is also now not showing, and instead shows an error. I am currently looking for alternatives.
We would like to inform you that we have been able to successfully bypass the challenges you reported allowing you to create multiple shipping rates for subscription product plans using shipping profiles.
Let us know if we can help with anything else.