Internationalize target country for SEO using language url path

Question

I'm adding now Internationalization support for English and French languages for my website running under a German domain .de (www.mysite.de)
he I18n will be handled by a different URL structure for SEO purposes.
www.mysite.de/en will handle English related content
www.mysite.de/fr will handle French related content, and so on
My first question is if from an SEO perspective I should move the German-related content under its path as well (www.mysite.de/de)?
If this is the case, then should I do a 301 Permanent Redirect to the www.mysite.de/de when someone comes to www.mysite.de.
Online I can see different examples.
apple.com for example handles US traffic and apple.com/fr the French one for example.
spotify.com has a 302 Temporary Redirect in place that forwards you to a specific language site like spotify.com/us for the US
I know that Google lets you specify somehow the language target associated with a specific URL in your site with something called 'Search Console geotargeting'. This is allowed just for gTLD domains so I can not do it with mine as it uses a specific German country domain (.de).

I'm wondering if there is something I would need to configure on the Google side using the webmaster tool or if hreflang metatag will be enough to signal that for example, all pages under /fr are for French related searches.