This phone stand is meant to hold your phone while suction cupped to a smooth surface. The suction cup must fit in the 6mm gap. The ones I purchased are 1.2 inch, they can be found at this Amazon link:

https://www.amazon.com/gp/product/B08GLG6DRY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

This part is designed for plane travel, specifically where the seat back in front of you has a screen.

The top part slides down the two top posts, and secures the top of the phone from tilting and falling off the bottom platform.

This is a work in progress, but I thought I'd still share for anyone that might want to try it out and leave some comments.

If you want to donate, my Venmo name is @JabobJuoha

Thanks!!!