this is my only concern as well, but I'm fairly sure that because my front end has the livesports wings and lip and looks a little extra aggressive it should hopefully work. This is also why I went for the varis spoiler, not the JAM one cause I reckon the varis one is a little less obnoxious.
but to be honest, I won't know until I see it in person either! my thinking was just that with the duck spoiler, the tte spoiler looks way too small and makes the duck spoiler look v out of place.
Heres hoping it works, worst case I'll have a spare varis spoiler for a future glanza rep/real glanza