Install Drupal distribution on Debian (Multisites) -- 2

Hello,

I need a Drupal website with a community space (opensocial) and a training space (LMS).
I want my members to have only one registration to have access to these two spaces (a menu to change space?)!
I found these two Drupal distri that can work in Multisite mode:

Can you tell me how long and what cost for:
1/ to install only OpenSocial on multisite mode?
2/ to install both with a single registration/connection?

- https://www.drupal.org/project/social
- https://www.drupal.org/project/opigno_lms

With Drupal it is possible to do them on Multisite mode.
https://www.drupal.org/docs/multisite-drupal/set-up-a-multisite

So I want a installation of Opensocial distribution on my main domain and LMS on a subdomain or in a repertory !
My cloud server is a Debian 11 with plesk obsidian.