To activate "carousel", and if your theme does not have a module nor does not support "light slider" you need to activate this option:
https://i.imgur.com/dYlM72s.png (its on module configuration page under modules > modules manager). The result will be working carousel and design equal to the design of your shop's warehouse theme.
Also - can we create universal rules for all products instead of defining related products on every single product level and can we have the option to show tag wise products as well?
module has "visibility conditions" where you can create "related products" instance that can appear on specific product pages but also on many product pages including "everywhere (on all products pages)".
available "visibility conditions" are:
- everywhere Turn this option on if you want to display this list of products on each product page
- Product pages Turn this option on if you want to display this list of related products on selected product pages
- Categories Turn this option on if you want to display this list of related products on product pages associated with selected category
- Manufacturers Turn this option on if you want to display this list of related products on product pages associated with selected manufacturers
- Features Turn this option on if you want to display this list of related products on product pages associated with selected features
so i confirm, with module you can create "related products" instance that will appear on many product pages. You do not have to it individually for each product.
best regards
milos