as for the belt clip part:
http://www.saberforum.com/index.php?topic=1801.0As to attaching one... I don't know much about how to and if it near the emitter is ok.
However I suggest somewhere between the place you hold your hands on the right hand side.
The Liberator model in general I have not owned one but the switch to me always seemed a little... in the way, so if it will not put any burden on your hands and you can do it. Go for it!
otherwise I still say right hand side somewhere between your hands while you hold it.
look at the other saber models with it, like the bellicose or the bane... all depends whether you prefer to hold your saber switch up or switch down (I think the bane is designed for switch up)