Install of multisite with MAMP

How do I install a multisite inside a folder inside htdocs?

I followed this tutorial:
https://perishablepress.com/wordpress-multisite-mamp/
But the tutorial is based on having all the files in the root of htdocs.

I am not getting the htaccess file to point correctly to my multisitetest folder.

From the tutorial:
“Lastly, create a blank file named .htaccess in your /htdocs/ directory and add the following code:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]

# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ – [L]
RewriteRule ^[_0-9a-zA-Z-]+/(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^[_0-9a-zA-Z-]+/(.*\.php)$ $1 [L]
RewriteRule . index.php [L]

——–

What do I need to correct for it to work inside the folder multisitetest?

Thank you.