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Your state can be a tree, if it needs to be, so you can nest.

A normal practice is to have a model per page. For e.g. https://github.com/rtfeldman/elm-spa-example/blob/master/src...

And you can have another item next to it for global state if you need to. https://github.com/ohanhi/elm-shared-state explains one way to do this

If you really really really can’t live without a statefull component, you can always build a custom element (which can be a wrapper around an elm app). But reusable views with fairly complex state are used; they require a little bit of wiring up, but it means you know exactly where to look when there’s a big/problem.

You can think of each root-level branch of the state tree as its own "model". In redux (I haven't used elm much) I implement generic components by finding a property that can be used to derive a unique key and creating an entry for each component in the reducer.