All special effects use an 'attachment' point on the model.
Auras use the 'Origin'. Sheilds and bonuses use the 'chest'. Some like stun and silence use 'Overhead'.
The reason they don't work on your model is because the creator did not take the time to add them!
If you send me the model, maybe I'll add the few basic ones. Those three are easy to edit in by hand with a text editor.