Flight controller vibration damping mount

I used to mount flight controllers on the drone with double-sided tape with some foam in between but got sick of it because it can come loose and will not be perfectly level all the time.
To reduce vibrations, it usually helps to add more mass the the damped system, so this holder has place to also add the receiver, gps and telemetry if you like.
The GPS is mounted on top with some offset to reduce any interference with the flight controller using 20mm M3 nylon spacers. But you can also use