Stabilize rotated video 9:16

Hello,

I recorded with my DSLR Camera in 16:9 1920x1080 format but Vertically. As the video is destined for Social Networks, in Premiere it is rotated 90 degrees to achieve the aspect ratio 9:16 = 1080x1920.
The problem is that I can't properly stabilize the videos since it does it as if it were in 16:9.
How do I achieve proper stabilization by having the original video rotated 90 degrees? It occurred to me that if I process and replace the videos to be 9:16 source it might work but this would be very inconvenient.

Thanks