Okay, if I were to use intersect underlying here....I would favor
rises and limit slope accordingly, with say 50-60 degree minimum.... Set altitude accordingly to range, using minimum (about half or third the maximum altitude of your terrain, leaving maximum set at default if you want snow caps. That way the snow layer
should adhere to the edge of your slope....and your slope angle would be similar to...///////
If you want the snow to cradle in the depressions only......do the opposite, sort of....
If you are using a solid snow image mask this should work fine. If you are using an alpha type mask, (that looks like rivers branching out from solid white areas), your snow will not be even if you use restraints. If you want to use that type of mask, you usually only have to limit altitude and stretch on a 1:1 ratio over terrrain.