I’ve tried a bunch of those things. Some work, some have issues. This one works for me: https://www.amazon.nl/dp/B0BXDQS4BD?ref_=pe_28126711_487767311_302_E_DDE_dt_1
Some didn’t do 1440p. Some only worked on only 1 HDMI port. (I’m using 2).
Probably not that helpful but maybe if some more people chime in we might found out what’s going on.
EDIT: Found this: USB-C/Thunderbolt Dock Megathread