Ability to create a view without a model

We have a situation where we want to list all models in a view which match certain tagging.

Currently, the views are created based on models only, which makes it impossible to achieve what we are looking for. With the amount of content we are anticipating, we can't take the route of grouping in folders because it requires a lot of manual effort to place and manage content in folders, and it could be prone to human errors.

We are looking for an option to either create a view without specifying a model, or the ability to select multiple models when creating a view.