It should already be on. Depending on which version you're using, SSDO should be the default, instead of SSAO. Open up the Console and type in "ssao" or "ssdo" and adjust the parameters in there.
Also for indoor scenes, it's better to use VisAreas and Portals. Not sure if you're aware of that, but it could be a reason to why it's not looking right.
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Also for indoor scenes, it's better to use VisAreas and Portals. Not sure if you're aware of that, but it could be a reason to why it's not looking right.