I have a fireplace that does not have a screen. I was going to order a screen that mounts to the face of the opening but of course when I measure the opening it isn't square. I think the company could make an odd-sized one, but I wonder how well the screen would work if the thing was out of square. and I can't get one of those stand up screens because the brick in front of the fire settled towards the room so it would always be in danger of falling into the room. So can I operate my fireplace safely without a screen if I get a grate that angles to the back and a fireproof hearth rug?