Any New Inexpensive, Alternate, or DIY Ideas For Suction Toy Platforms?

[Imperiallily]

So I saw a thread dated from 2013 similar to this, but I was wondering what kind of things models are using as platforms for suction toys in 2020?

 

[CherryCrush]

A plate, textbook, stool/chair, mirror. I have yet to find ANYTHING that wont cause to the toy start sliding around once the base gets wet though....