Long story short, I wanted a way to put my portable LCD in my backpack. I also wanted a way to set it up on my desk.

I found an unused phone holder and used it. https://www.amazon.com/gp/product/B074PDJ6M8/ to hold my 15" screen: https://www.amazon.com/gp/product/B07TWGBG3P/

This mount allows you to use the VESA mount to connect it to the phone mount. Its likely you can use it with other things as well. Because it is so small of a mount I Can pack everything up in my backpack. A quick couple of turns and I'm good to go.

Previously I used magents, but the screen was too heavy for it. The alternative are some mounts that must stay attached to the LCD which are not great for sticking in the backpack.