Should I add Product schema?

Only if you sell discrete products. For B2B SaaS, SoftwareApplication on the home and platform pages is enough.

Does duplicate schema hurt?

Stacking is fine. Conflicting values across pages can confuse engines; keep entity names consistent.

Schema.org has hundreds of types. For AEO, seven do almost all the work.

Type	Use it for
`Organization`	Sitewide. Names the entity.
`WebSite`	Sitewide. Names the site itself.
`BreadcrumbList`	Every internal page. Helps engines understand hierarchy.
`FAQPage`	FAQ pages, capability pages, blog posts with Q&A.
`HowTo`	Step-by-step pages (e.g. installation, rollout).
`Article`	Long-form editorial content.
`BlogPosting`	Blog posts. Stacks with FAQPage if there is a Q&A section.

SiteSonar injects the right schema on every page automatically, validates it, and updates it when content changes. See AI visibility →