The Pro Plan offers a Crop - Rotation Feature that corrects the orientation of your image and identifies the area of interest where your fields are present. The OCR model then reads the fields you're looking for from this new image, significantly improving the model accuracy.
You would not need to train a separate model to identify the degree of rotation of the image or the area of interest. The OCR model on the Pro Plan is built in with the Crop Rotation feature, behaving like like two sides of a coin - working automatically, without the need of human intervention.