Trying to place objects behind an image target. Vuforia 10 + Unity 2020.3.16f1

Basically, I have a device sitting vertically with the image target on it. This device has some ports where I want the 3d objects to sit. When the image gets detected, the virtual objects appears either on top of the image or little front of the image target. In the editor,I can only change x and y position. Any change in z axis do not gets reflected once the app is built on Hololens 2. Using Vuforia engine 10 and unity 2020.3.16f1. Any help, thanks!