Depth view in reflection for Oculus

Hi guys,
I'd like to build a demo with several mirrors for the Oculus. And I can't manage to have anything but a flat mirror (aka no depth view at all in the reflection)
I assume that a depth view could only be done with a dual realtime rendering
Is this a thing that may be done ?

I'm using a reflection probe with realtime rendering and an every frame refresh mode. Near that i use some planes which have a standard shader with Metallic and Smoothness both set to 1

Any clue is really welcome