Did you try a different version of the dock you mentioned, this one seems to support 2X 4K60. https://www.amazon.com/dp/B086DXLF37/ref=emc_b_5_mob_t

Also, look at USB4 and USB-C docks, TB docks tend to come with more bells and whistles (like PD) and you’re really not running too much that would require heavy duty performance.

This appears to be the solution for my use case, but I find it difficult to spend $80 for an adapter when my whole surface Go 2 cost me $300 new 9 months ago. https://smile.amazon.com/dp/B086DXLF37/ref=emc_b_5_i ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I'll probably just order this https://www.amazon.com/Sisyphy-Surface-Connect-Compatible-Microsoft/dp/B08KYGSY3G/ref=sr_1_4?crid=4MYCMO9HCUE8&dchild=1&keywords=surface+connect+to+usb-c&qid=1615899483&sprefix=surface+connect%2Caps%2C247&sr=8-4

I got this for mine: https://www.amazon.com/Cable-Matters-201331-BLK-Computer-Docking/dp/B086DXLF37

Works perfect for me. Dual screens (1440p ultrawide 120hz and 2560x2880 LG DualUp), ethernet and peripherals.