As always, the question is -- do you actually need these versions, or can you make do with the more modern 7.4 branch? Most of my servers only have 5.6 (sigh -- one extemely laggard client!), 7.4, and 8.1 (somewhat soon to switch over to 8.2 after testing). Decrease your attack surface and run the most modern versions you can with security & bug fixes in place.