I test it, it works, but my understand of elektricity is not big enough that I can say that its stable to use. See @adminX’s post above.
Now I am using only 2 drives, as I don’t need more storage right now, but in future I will power the box with dedicated PSU (around 80W, 1,5A on 1 drive counted, so 41,512=72W), at least for 12V line as on 5V shouldn’t be so big drain.
@adminX Dumb question: Its possible to use 5V from TO and 12V from dedicated PSU?
I discuss this topic here: https://www.root.cz/zpravicky/projekt-turris-omnia-povede-patrick-zandl-byvaly-sefredaktor-lupa-cz/#o903957 (CZ)
There are some good ideas, and also PSU that can be used.