DeletedUser3157
I would say that with Alcatraz extra spots became obsolete. You just need to have 1 hideout and be a little bit patient.
It's also true for the 5th premium spot in regular military buildings.
Regular military buildings u usually raze. Hideouts are more or less forever. Alcatraz sure helps, but more the normal units u have, more u can lose them before using unattached alcatraz units. Meaning more unattached units u can save at the end of the day.