I found out that I can export the entire 3d model with the background image into an .obj file and it opens ok with e.g. meshlab

What I want is to export only the floor with the background image.

Option1 that I tried is to place the texture in the background image
If I select the floor for export and the floor is displayed (tick Modify rooms -> Display floor), then in the exported 3d model, the background image is obscured by the floor color
If I select the floor for export and the floor is NOT displayed (untick Modify rooms -> Display floor), then the floor is not exported and the exported 3d model is empty.

Option2 that I tried is to place the texture as the floor texture of the room (Modify rooms -> Floor -> Texture -> Import -> Choose Image ...)
But it is difficult to adjust the size of the texture such that it will cover exactly the floor, even though I specify the exact Width and Height.
It would have been helpful if the floor texture would be seen in the 2d view, because then I would adjust the floor such that the texture fits it exactly.
But the texture is only seen in the 3d View panel

Is it possible to show the floor texture in the 2d view as well?

Thanks,
Avner