Display a hologram on a whole wall

Hello vuforia forum,

I am trying to display a big hologram on a whole room's wall (2.5mX4m). My solution is using Vuforia to scan image target that will be my anchor point and then display the hologram on the whole wall (with Vuforia engine). I succeeded to display it but it seems that the hologram does not fit exactly to the wall. There is a deviation on the hologram angle that can be caused from the image target angle. I was thinking to locate the hologram based on two targets instead of one could resolve this

Is it possible to do something like this? Or any other ideas to solve this problem?  

In addition, i was trying to use HoloToolKit Spatial Understanding but i had some problems to combine it with Vuforia image target detection...

Thanks! Gerard