WordPress has an installer, Prestashop does not, so you must download the prestashop files and install a website with the following command:
sudo site example.com -mysql
After that upload the files into the directory of the site /var/www/meuprestashop/htdocs/
Adjust permissions with the following commands:
chown -R www-data:www-data .
chmod g+rw .
Run the above commands within the directory /var/www/meuprestashop/htdocs/
Proceed with the installation of your browser and if you want to install SSL run the command:
sudo site example.com -ssl=on
It is possible that you need to configure some rules in Nginx for your Prestashop application to work, but this is the initial configuration.