I struggled to find a minimalistic-looking phone stand to fit my needs. So I decided to create my own and I have made the design fully parametric and easily customizable with the Parametric Model Maker.
The included model is the one shown in the pictures which I designed for my needs. However it probably won't fit your phone or tablet, but you can easily change the width, height and more to exactly fit your needs.
Keep in mind, that the angle parameters refer to the angle of the back support of the stand not the actual angle of the phone. I could change this if this would be a desired feature.