You can also use my replace_object script (attached). With this you can put any place holder object in the editor--a barrel for example--and put it exactly where you want it, and set its azimuth.
You then put this line of code in it's init:
[this, "Land_SS_hangar", "myHangar"] exec "replace_object.sqs";
When the mission starts, this script creates the desired object (the hangar) at the position of the placeholder object, and set its direction to match the placeholder object. Then the placeholder object is deleted.
Advantages of this approach are:
1. You don't need a editor addon.
2. You have an object in the editor that you can see and move around, and adjust azimuth, until you get it exactly where you want it.
Note: The script basically does what Planck said.