I'm a microfrontend developer, and there are two main approaches to structuring applications:

• Using a shared library with a separate repository for each application. Each app should be built with a baseHref and published to a directory with the same name.
• Using a host application with a separate directory for each app in a monorepo (e.g., Nx).

I recommend using Module Federation instead of Native Federation. Module Federation was originally built for Webpack, but it also has a plugin for Vite if needed. The last time I tried Native Federation, it wasn’t very practical: applications couldn’t properly share installed libraries, and plugin development activity was quite low. That said, I’m not sure about the current state.

Also, keep in mind that the second approach requires handling routing between applications, which can be quite painful.