How to change display orientation in Android on startup

There are plenty of apps on the market that can force rotation of the screen to any desired orientation:
https://play.google.com/store/apps/details?id=bong.android.androidlock&hl=en
https://play.google.com/store/apps/details?id=nl.fameit.rotate&hl=en
 
I believe some of those have settings to autostart on boot and force orientation to the one desired.
 
Some alternatives showing how to force Android to boot into portrait or landscape mode are discussed here:
https://android.stackexchange.com/questions/10808/how-is-the-default-screen-orientation-in-android-specified