Using a 40 MHz wide channel I have tested 600 Mbps through it (single direction) so you should be fine using a 20 MHz wide channel. The second link I would lean towards using a 40 MHz wide channel, but you will want to make sure your alignment is pretty spot on. There isn’t really a lot of wiggle room at 2 km if you want a consistent and reliable link.
Real world throughput, I have gotten ~450 Mbps through it, but I am pretty sure the limitation was another backhaul going back to my CO. The B24 is the 3rd wireless link in a line and goes from one of my towers to my house so I can’t really stress test it without causing issues elsewhere in the network or being up at hours not meant for mankind.