Please lock to the maximum angle up/down for placing paths, so it is not possible to get the angle to a point where the preview becomes red-colored.
There is no benefit to being able to preview a sloping you cannot place, and it would make it easier to get to the maximum sloping, without the fine-adjustment needed to find the maximum.
There is no benefit to being able to preview a sloping you cannot place, and it would make it easier to get to the maximum sloping, without the fine-adjustment needed to find the maximum.