Hi, I have a zero clearance Firebox that I would like to do a pellet insert for. One issue I'm running into is that the floor of the firebox is about 3 or 4 inches higher than the hearth. One thing I have considered is getting a hearth riser, but I'm not sure exactly how they fit or how they work. Is it possible to get one that is generic, that will accommodate any insert that fits on top of it? Or can I only use the one that's made for the particular stove? I'm interested in the Harman Accentra 52i insert, but I'm not seeing any hearth riser accessory. If you have one, a pic would be great. Thanks so much for your help!