2D Collider Auto-Tiling for Images? (GUI)

Setup:

I've got a simple setup. I've got four walls surrounding my sceen. I want these walls to scale with the display's aspect, which is easy to achive using canvas for the game.

Problem is that 2D collider's auto-tiling only works for sprites, which I can't use in my use-case.

My question:

Is there any alternative to scale my 2D Colider with the Image?