

You can buy the rails by themselves if you wanted to make your own. Using finished lumber works very well if you’re handy with tools.
I made my own, but normal size to fit a specific space in my closet.
I made mine like this - https://youtu.be/j8Yq5aWapeg
Not sure why you’re downvote, you’re absolutely right. People scan for open ports all day long and will eventually find your shit and try to break in. In my work environment, I see thousands of login attempts daily on brand new accounts, just because something discovered they exist and want to check it out.