You can't. Btw, have you tried removing ability 'Amov' from the unit? It removes movement abilities of the unit but I don't know if it makes it unable to face.
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HappyTauren
Yours Truly
I'll try. Will report back to see if it works or no.
Yours Truly
Tried, they can't move for sure, but they can't turn as well.
HappyTauren
Have you tried setting the movement type to "float"? You can place the unit but it won't be able to move.
Yours Truly
Just tested it. Seems like "float" counts ground collision even with 0 collision. I'm making an archer unit on a tower.
Yours Truly
Okay, I just figured out a way around the system and it works like a charm! Thanks for all your help. 
HappyTauren
Oh nice, what did you do?