As you know the fluids go real bad when colliding 3d objects, or plane at angle other than vertical or horizontal.
Current engine is a little off balanced.
I can render in 0.04 x 0.04 x 0.04 m domain or in 2.7 x 2.7 x 0.15 m domain from resolution 300 - 500. Memory use goes to 7 Gb, one fluid frame mesh has 4 000 000 - 6 000 000 vertekses.
But the stair pattern will ruin all the work. The pattern will affect the opposite fluid layer surface when it’s thinn. It’s like the max fluid simulation Z resolution is 4.
6.5 Gb to render 4 step stair at resolution 450