This is a stand for iPad pro 12.9 inches.
You can easily create one for your tablet by branching my onShape file: https://cad.onshape.com/documents/d1434b490c22972ff1559eb3/w/3bec4244b99e0c5721cccfa0/e/9b628b6557156b23244f0111
The author hasn't provided the model origin yet.