The 120v AC charger that came with it will do 8 or 12 amps (you can change that in the car menus) by default. That is your L1.
L2 is higher voltage 240v AC, and there are several options there. I believe that maxes out at about 4 miles per hour of charge.
As you have found out, that adapter you are ordering will let you use the included charger at 240v, so twice the voltage. Still 12 amps, but twice the speed, so I'm guessing about 8 miles per hour...
Then you move to the EVSEs that you can buy. They usually start at 16 amps (c. 16 miles per hour) at the lower end and most go up to 32 amps.
I believe the 32 amps option gets you about 24 miles per hour.
Then, you get to the DC fast charge options. That is around 400- volts DC. AMPs vary wildly depending...
There are low amperage (25 amp) ones and they go upwards from there to 100+ amps...
Thanx for the point of correction below!!!
Not 25 amp.. 25 kWh (and apparently it's 24kWh) and that's I guess about 100 miles per hour???
Apparently that is about 32amps and 480 volts DC.. From: https://www.chargepoint.com/products/commercial/cpe100/