This is a wall mount for the SonicModell AR Wing Pro flying wing airplane. It is designed to be mounted with either screws or mounting tape. If you angle the plane foreword on the mount, It allows for proper mounting clearance when you have a large TBS Crossfire Immortal T antenna on the wing.
Check the attached reference picture for proper print orientation, and the minimal amount of support required.
The author hasn't provided the model origin yet.