Does a Blazing Brazier need "line of sight"?

I'm currently building a new base for myself. I've decided on a two wall set up, with an inner wall of stone, with a weaker outer wall and a 2 square space between them (to minimize the effect of splash damage (as far as I've been able to understand it).
I'm planning on placing Blazing Braziers in the corridor between the two walls, along the outside of the stone wall.
I've not seen Braziers in action and the Wiki provides no real info on how the damage is dealt out, and I'm hoping some of you might enlighten me.
Does a Brazier need "line of sight"? Or does the Brazier ignore obstructions such as walls and buildings and "shoots" through them?
I'm planning on placing Blazing Braziers in the corridor between the two walls, along the outside of the stone wall.
I've not seen Braziers in action and the Wiki provides no real info on how the damage is dealt out, and I'm hoping some of you might enlighten me.
Does a Brazier need "line of sight"? Or does the Brazier ignore obstructions such as walls and buildings and "shoots" through them?