This is a two piece soap dish I designed that uses two suction cups to attach it to any clean non-porous surface, such as a mirror or the walls of a shower / bathtub. The base has slots in it for draining and the tray has ridges to lift the soap off the bottom to aid with drying. There are a couple of different ways you can use this dish, first is just the soap dish itself without the tray, this will allow the soap to dry and the water to drain through the bottom.  The next way you can use this tray is to use it by itself, if you use the tray by itself I recommend you put on some rubber stick on pads so the tray does not slide around. And the final way you can use this soap dish is to use the two parts together, this will make it so that the water from the soap doesn't drain and leave a mess but the tray can still come out to clean and drain as needed.

Here is the link to the suction cups that I found that worked best.

https://www.amazon.com/dp/B09BTW2148?ref=ppx_yo2ov_dt_b_fed_asin_title

I have also uploaded the Fusion files as well as STEP and STL incase you want to modify the soap dish.