Mounting orientation

I am planning to buy pixhawk3 pro for my drones. However, the space for flight controller is quite restricted. So I would like to mount the pixhawk3 pro with the ROTATION_ROLL90_YAW_270 orientation.
But, I concern about internal vibration isolator of pixhawk3 pro. Does isolator can work properly within such orientation?
If some probrem to be concerned, I would like to find some other place to fix horizontally.
Thank you!

The roll90 is not advised due to the conception of the vibration isolator system.