So long as the item is only hosted in or on one software product and you are not giving users access to the underlying item (i.e. the item is fully integrated into the End Product and cannot be separated from the End Product) a single license would be all that is needed to use the item within a software or SaaS end product. If you want to use the item in multiple end products you will need to register it for each software or application the item is used within.
If your SaaS is free to access, a Regular License is fine, but if users can/must pay to access in any way (e.g. a Pro/Premium version) an Extended License would be required for the item.