I had the same problem and this is what I got from Amazon: https://www.amazon.com/gp/product/B0838TGJCJ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

The only downside from extended use is that the fan from the dock couldn't cool the phone and once so far everything froze. I had the cable since March, so . . .

But yah, it works, your choice should work too.

What I like about actual Samsung DeX dock, you are guaranteed monitor support. With 3rd party saying 4k and other resolution, I found that one of my USB-C hub of 4K doesn't support it: https://www.amazon.com/gp/product/B07ZR57G7B/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

But with my Samsung DeX dock and Pad, I get my 2560X1080 resolution, yah not 4K but the hub didn't support but only 1920X1080 also. Point is if you want an ultra wide of some kind in the future, you will need the Samsung DeX dock or pad to get it.