Smoked Glass presents the same problem to the Act Labs guns as it does to the Topgun LCD Guns. You're reducing the amount of light going through so why would you think that it's less of a problem for the Act Labs Ones??
That said..... The Topgun's work perfectly well through smoked glass. Several people are using them that way. The reason is that the stands produce infra-red light "not" visible light. So the smoked glass has very little effect on them..... Take a look at the front of your video recorder, the IR reciever is usually mounted behind a piece of smoke coloured plastic. So in fact the Act Labs guns, which use visible light, will actually perform worse than the Topguns in your application.
There's also nothing stopping you mounting the LED stands on this side of the glass if you don't mind seeing them.
Best Regards,
Julian (Fozzy The Bear)