Change the position of 3D Model when Image was recognized on ARFoudation. Can anyone help me please?

I did the image recognition on ARFoundation, the problem is that the 3D model always appears in the center of the image, can anyone help me change this position? I want the 3D model to appear lower than the image when recognizing the image. Thank you.,I did the image recognition on ARFoundation, the problem is that the 3D model always appears in the center of the image, can anyone help me change this position? I want the 3D model to appear lower than the image when recognizing the image. Thank you.