To display multiple models in the 1 viewer instance, you simply need to add ‘cat=123’ to your shortcode, where 123 is the ID number of the category the models/products belong to. This will display their Featured Images as thumbnails in the bottom corner of the viewer.
ardisplay cat=123 (Contained within square brackets).
Using the AR For WordPress plugin you can find the category ID by going to the ‘AR Models’ -> ‘AR Categories’ page and edit a desired category. When editing your category, the URL for the edit page will tell you the ID number for that category. e.g. https://yourdomain.com/wp-admin/term.php?taxonomy=model_category&tag_ID=123&post_type=armodels
Using the AR For Woocommerce plugin you can find the category ID by going to the ‘Product’ -> ‘Categories’ page and edit a desired category. When editing your category, the URL for the dit page will tell you the ID number for that category. e.g. https://yourdomain.com/wp-admin/term.php?taxonomy=product_cat&tag_ID=25&post_type=product