The best place to farm for these is in the very first mission of Anvil's chapter. There are a lot of wide open straight aways to perform the powerslides on. Just accelerate and hold the triangle button down for as long as possible without any interuptions. You probably won't get all 10 on your first 1 or 2 times playing through the area, but just keep completing the mission and replaying it and the trophy should eventually pop.