I did not have a soap tray in my shower so I created one. Unfortunately, the tile in my shower did not work with the suction cups. But maybe you have a shower that suction cups will stick to.
[Suciton Cups Sold Separately]
I designed this object. Feel free to use it however you want.
Very easy to print. no supports needed.
You will need to find some suction cups that will fit with this.
Because this will be wet most of the time I printed this with full infill and with PETG.
Here are the suction cups I used...
https://www.amazon.com/gp/product/B073S5TX8W
The author hasn't provided the model origin yet.