This holder will let you place once for all the transmitter under your desk. It have not being designed to be removal.
It's ugly but work's well. You can place it with 3M tape under a glass table or any desk. The battery tray is still accessible.
Since there is a lot of steelseries Arctis helmet, I designed a 3d printed test part, just to verify the general fitment. Then you can proceed to the full part.
Happy printing.
The author hasn't provided the model origin yet.