Unravel model directory path does not work with multisite

[johnnyicarus]

The Sober/Unravel class uses wp_upload_dir() to determine the models directory, but in the context of sites that are not the primary site in a multisite install, wp_upload_dir() is set to something like wp-content/uploads/sites/:site_number, so (e.g.) custom post types and taxonomies declared via models/unravel seems to fail (WP Docs)

Figured this out while using models/unravel on a non-bedrock site I support and used get_theme_root() to set the models directory path, but I'm not sure if that is a generalisable solution.