The dropdown corner boost can be done on any edge in the game. To do a dropdown corner boost, drop down from an edge and wall jump.

You can do this from a variety of objects; signposts are the main one, but you can also do these on the brick walls found in lane.

To execute this method:

1. Drop down from whatever edge you are on. After, stop holding the movement keys.
2. Nearly immediately after, repress the desired movement key and Wall Jump.
3. If done correctly, you should Corner Boost high into the air.

One object that you are able to do this on are the signposts found throughout the map. For these signs, mantle up, then drop down.