I was wondering the about the effect a duplicate/similar codebase of products would have on a sites SEO across 190 domains.
We have a dealer group with 190 for a certain class of products e.g. hardware & building supplies in the same country. As part of thier membership to the dealer group our members recieve printed catalogues of 2500 - 7000 products, they also get a web solution with all the catalogue products listed which allows b2b ordering, searching and quote requests on these items. We are looking into making these sites more SEO friendly (readable url's, responsive, keywords etc) nothing serious, pretty much just make sure we check all the basics. All the websites point to the same codebase, which then fetches the members template and product/category visibility and displays the site.
My questions are as follows...
Would there be any negative ranking effect based on the repeated listings of products from different domains served from the same ip? Thousands of products have identical short and long descriptions,keywords,codes and images.
What would be the best way to implement and xml sitemap for each different domain? I have considered generating a sitemap for each domain in a directory i.e /allsitemaps with a disallow bots file and then adding a route to the site that points to the correct sitemap depending on the url so www.sample.com/sitemap.xml actually returns www.sample.com/allsitemaps/sample.com/sitemap.xml. Do you think this approach would work?
Sorry if the questions seem basic. I have just enough SEO knowledge to get a unique site indexed reasonably well, but I have no idea how search engines react to a situation like this and am struggling to find any information on the topic.
Thanks in advance.