Universal grids exist, but custom-fit JAL grids are better because they account for the specific corner radius and drain location of your sink.
Most JAL dispensers are “top-fill.” You simply pull off the pump head and pour soap directly into the bottle from above the counter, no need to crawl under the sink.
Stainless steel colanders are dishwasher safe. Wood or bamboo accessories should always be hand-washed to prevent warping.
Accessories like grids actually prevent scratches. However, dragging a metal colander across the rim can cause wear, so many feature rubberised bumpers for protection.