The 6-20P (most common for most all other brands) currently seems to sell evenly with the 14-50P (Tesla style.)
Since the converter box is designed for 16 amp / 20 amp surge usage, it is perfect for level 2 charging.
Electricians will charge between $800 to $3000 to install the required receptacle in your home/office.
For $350 you are ready to go and you can take it with you too!