This is what I use:

https://smile.amazon.com/gp/product/B07W5F556K/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Along with:

https://smile.amazon.com/gp/product/B07K4HTBSM/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

It fits very nicely on the standard case, if you cut off the retaining portion of the bracket. It's also very thin. I then just use the velcro strap to hold it all together.