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Getting the object to display under (not on top of) Vumark or Image Target

I've been trying to place my content (3D models) under a detected Vumark / Image Target without any success. That is, what I want is the camera to show the target and the content is underneath (not on top) of the target. 

Right now, the content is a child of the target and no matter how much I move the content below the target, it always appears on top of the target albeit, the further down the y axis I go, the content shrinks (perspective?).

I've read the responses to:

https://developer.vuforia.com/forum/unity-extension-technical-discussion/3d-object-under-marker

but this doesn't help and if anything the DepthMask material does just the opposite of what I'd like to accomplish (i.e. it cuts all objects above the plane.

I'm using Unity 2018.1.2f1 and Vuforia v. 7.2.20.

Any help would be greatly appreciated!

Thanks!