sitemap – Is there a SEO or pagerank benefit in grouping (rel = "alternate") of multilingual websites (using multiple domains) together?

I am building this website that will be multi-region / multi-language.

And for that, Google suggests the following:

https://support.google.com/webmasters/answer/182192?hl=en

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As my domain will have to change according to the language of the country, I will have to go with Option 1.

A country-specific domain.

Example:

  • www.name-in-english.net
  • www.name-in-deutsch.net
  • www.name-in-spanish.net
  • www.name-in-french.net

Since they all have different domains, if I don't let Google know that they are the same website, they will all be treated as unique unique websites.

Google suggests that you can "group" them using one of those 3 options:

https://support.google.com/webmasters/answer/189077

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If I'm doing it, I'll use the Sitemap option.

But my question is:

What do I gain by letting Google know that all of these websites are the same, but in different languages? What will be different if I let Google think that they are all unique and separate websites?

Do I earn some SEO or pagerank doing that?

I mean, what if I get a lot of traffic from my website in English? Does that benefit my results from other languages ​​in the other domains?

Sitemap best practices for multilingual websites: should I list my URLs in each language or is it enough to use rel = "alternate" + hreflang?

I am working on the site maps of a multilingual website and I have doubts about the best practices to refer to each language version of a page.

For a little background, the website refers to around 20,000 places with community comments and descriptions. The website is available in 5 languages ​​(website.com/fr; website.com/it …)

At the moment, my site map only refers to pages in English and on the site map for each page that I specify for each language (as well as English) as recommended by Google.

In Google Search Console, I see that approximately 75% of pages with valid coverage are described as "indexed, not submitted on Sitemap", which makes me think that the alternative link with the hreflang attribute is not enough to "send" the Google page to index it.

Should I list the pages in the 5 languages ​​on my site map and use them too? in each link?