When it comes to the breadcrumbs, their positioning doesn’t help in the ranking for SEO. According to Google’s John Mueller, the placement and location of the breadcrumbs really don’t matter in SEO.
Tweet By John Mueller
Great question — no, the placement doesn't matter for SEO. We use breadcrumbs for crawling (finding internal links) & for rich results (structured data); both don't depend on placement of the breadcrumbs.
— ? John ? (@JohnMu) April 25, 2021