Display object panel in front of camera with correct rotation and position (no parent)

Hi guys,

I want to display a object directly in front of the camera (offset = (0,-0.5,1)). The object has a x-rotation of -45. The object should follow the camera and never change its rotation and offset. -> The player can turn around and see the object. I don't want to solve this with a parent/child construction. I tried LookAt() and Transform.forward but I couldn't achieve the needed result. Its for a hololens test.

Thanks for all suggestions!