While possible to get in any race, I'd suggest focusing on a Versus 1v1 event. In Season 1, consider the Audi R8 e-tron versus Tesla Model S race.
Get in line with the racer and knock them down. Then brake and wait for the racer to catch up and do it again. This is probably the easiest way since you can still easily win the race while going for the knock downs.
Trying during a typical race will more likely cause a lower place finish, so if you want, you could probably go for