These 2 plateau pieces are meant to divide water at the plateau level and able to be placed around the edges of the base. “Plateau-step-split” has narrower flow channels and the “_orig” has original sized plateau channels. I tried using these with a split fountain but could not get them to work due to decrease in water flow once water hit the plateau. Using a single channel fountain it worked.

Please feel free to post a make if you like it!