pcie usb 3 ucb-c expansion

Hi, I am looking to add some UCB 3 ports to my PC (A Dell 5040 optiplex) and am looking at expansion cards to take the unused PCIe slot. I see from amazon that there appear to be approx 3 types. 1. Those that slot into a PCIe slot on their own 2. Those similiar to above but have either a 4 or...