I just installed Virtualmin on my VPS. After that, I configured it and added two virtual servers to it. When I add a script to one of my virtual servers, it adds scripts separately to each. Until now, I had Plesk control panel and it using all modules like mailboxes, PHPMyAdmin and etc only once and all users and websites only have their own subscription in them, but here it stores each script separately for every website. I think it's not good because we should store more space and it makes more complexity to manage them.