Place units without factories

What XML-code is needed to create a game without factories, allowing to place units in any owned territory during the placement phase?

Or in already existing maps: What has to be done/changed to make unit placement factory-independent?

I already noticed
<property name="Placement Restricted By Factory" value="true" editable="false">
      <boolean/>
    </property>
<property name="Unit Placement Restrictions" value="true" editable="true">
      <boolean/>
    </property>

... but this seems to address different purposes - or just is not enough.

I also found units such as Mortella_Tower or Fortress in Napoleonic Empires, but could not figure out how to enable them to be placed without factory.

Thank you.

[crazy_german]

Its a unit attachment, isConstruction. Will allow to place in any territory controlled since the start of the turn, there are additional options for how many you can place per turn and per territory. PoS 2 xml has the details

Great, thank you :-)