This is the one I ended up using (Totu, on sale for $69.99), via DisplayLink on my MacBook Air M1 Big Sur:

https://www.amazon.com/dp/B08H7GHVFN/ref=cm_sw_r_cp_api_glt_fabc_V9MA2H98R1ZR30WA20EB?_encoding=UTF8&psc=1

Probably other options but pissed after dropping $200+ on a nice Kensington, trying to use a couple older Dells, and an Anker, so I’m sticking with this Totu and calling it a day.

Side note, I could never get the D6000 to detect both monitors. Even with the Totu working, and the D6000 working on my PC. Not sure what the issue is there, but was starting to believe these were all made-up solutions until the Totu worked.