OBJ Models Rotated after Import

If importing .obj files, note that the obj file may be rotated as the exporting application may have different axes directions. e.g. for Reality Capture adjust the export settings: Set a rotation of -90 X and -90 Y

If importing from another application, then you may need to experiment with its export settings, or:

Create a Coordinate Reference System for your model and add rotations to suit your situation.