We have an e-commerce client that is launching a new site. In setting up for it they decided that they want to change their navigation on the site and url structure. So everything being even, the new site will have appropriate 301 and it's built on Magento so the product pages are all structured as website.com/product-A but the category pages will now be deeper than before. So before it was website.com/product-category/product-sub-category will now be website.com/more generic category/product-category/new-subcategory/product-category. Hope that makes sense. I'm not as worried about the 301's or specific products but I'm worried the category pages dropping a folder level will hurt page authority. Any thoughts, am I being overly nervous?

I'm thinking this is a silly question, but I've never had to deal with it I thought I'd ask. Ok is there a tool out there that will show all the redirects to a domain. I'm working on a project that I keep stumbling on urls that redirect to the site I'm studying. They don't show up in Open Site or ahrefs as linking domains, but they keep popping up on me. Any thoughts?