the phrase "suitable folder" conveys very little information.
"Suitable folder" on linux systems (as far as I know), doesn't actually mean very much.
I mean, I have some arduino code I've downloaded on my Mac, and it won't actually work if I try to execute it from the "Downloads" folder, and many Windows setups will get upset if things haven't been installed in standard places by signed installers. Linux is more like - put it in /usr/bin, put it in /usr/local/bin
put it in ~/bin, put it someplace special that your application manager likes... "whatever!" (and, alas, the "preferred" location tends to change depending on exactly which distribution and desktop you're using.)