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Sitemaps are only valid for pages that appear below them in the site hierarchy.:
A sitemap can be posted anywhere on your site, but a sitemap affects only descendants of the parent directory. Therefore, a sitemap posted at the site root can affect all files on the site, which is where we recommend posting your sitemaps.
By putting your sitemap in a /...
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There is a chance that Google may consider them duplicate or near duplicate and canonicalise (merge) them to one of the duplicates. This could mean that one will rank and the others will be considered as the same.
The best way to find out is to check them in the Google Search Console to see if their canonical values are to themselves or another one in the ...
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SEORoundTable.com quotes John Mueller of Google in 2017 as saying,
Google can handle sites on IPv6 & HTTP/2 all just fine with Google web
search
, however he goes on to say you should still support IP4 and HTTP/1x. If you're not sure if you can use IP6 only, test with Google's Fetch or URL inspection.
They go on to quote Mueller as saying
If ...
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