Wordpress Installing 2 wordpress websites under the same VHOST

Hey and thank you for passing by! This community definitely changed in the good way @eva2000 is still working hard, I appreciate your work!!!

I'm trying to setup 2 different themes, one is for the mainpage (SHOP) and the second one is for BLOG (because one or other has great features that I'd like to use).

Now the challenge is: Create 2 wordpress websites under the same vhost. One under /blog and the other is @. How is it possible? I'm trying out this guide: Wordpress - centmin.sh menu option 22 - How to switch Wordpress to subdirectory

Also. I know that it's possible to share database entries for users and their posts, but is it possible to share the items in the cart?

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Here's what I'm going to use to share database entries in wp-config.php of /blog website:
Where "wpblog_" is the table prefix for BLOG.
And "wp_" is a prefix for the main page.

Code:

$table_prefix  = 'wpblog_';
define('CUSTOM_USER_TABLE', 'wp_users');
define('CUSTOM_USER_META_TABLE', 'wp_usermeta');

Thank you!