Vuforia: occlude image target?

Hello!

I am trying to build a Vuforia experience, where the image target triggers different objects surrounding it, but also in the background of it. So far, I have not managed to occlude the image target from what it is triggering (not be covered by it). I tried arranging content differently, having 2 different image targets and some shaders (although I had no clear instructions) - but to no avail.

Does anyone know a solution for this or has an idea what I could try? Would be very much appreciated!

Thank you.