I use it as a permanent connection on a Behringer Pro-800 inside a Flyht Pro case and it works very well for that, but keep in mind that the midi connector itself is slightly longer than needed, so even if the cable is L-shaped, it will not sit completely flat to the connector. Some millimeters will remain.
Also, each connector is L-shaped in the opposite direction, so one connector's cable goes to the right and the other to the left, which is handy depending on the adjacent connectors.