I'm replacing the steps on my front porch, but unlike most steps these steps arise from the side of the porch and not the front. Because of this, there is a 1/4" in 12" slope on the porch floor from the house side to the outside for drainage. I would like the steps to be level, but this means the riser on the house end will be two inches higher than the outside end (8' width). Am I correct in assuming that the stairs should be level and not sloped as the porch is?