This is a starter part to making attachments to a Galaxy Note 20 Ultra phone with a Spigen Tough Armor case. This clip fits snugly to the top of the phone and can be modified to add what ever device you want to attach to your phone.
I made a version to attach my MySoundy GO case to my phone for portable operations.
https://www.printables.com/model/927954-mount-for-my-mysondy-go-on-android-phone-w-spigen
Fits this phone case: https://www.amazon.com/gp/product/B089CPVHJX/
The author marked this model as their own original creation.