Redirect rules in .htaccess for multiple Wordpress installation

I currently have 2 Wordpress installations as:

https://www.example.com https://www.example.com/subdirectory

The .htaccess for https://www.example.com has the following rules:

RewriteEngine on
RewriteCond %{HTTP_HOST} ^example.com [NC]
RewriteRule ^(.*)$ https://www.example.com/$1 [L,R=301,NC]

RewriteEngine On
RewriteCond %{HTTP:X-Forwarded-Proto} !https
RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [R=301,L]

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

And the .htaccess of https://www.example.com/subdirectory looks like this:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

How do I force https re-direct as per the following:

1. http://www.example.com/subdirectory to https://www.example.com/subdirectory
2. http://example.com/subdirectory to https://www.example.com/subdirectory
3. https://example.com/subdirectory to https://www.example.com/subdirectory