I have the altrider plate.
Word of warning. If you are changing the filter for the first time, take the plate off.
My filter was spun on by godzilla himself. I ended leaving the plate on and after fighting with it for a while, finally got it to spin off.
It clears the plate without issue, and a new yamaha filter went it.
The plate has two drain holes on it. it's best to drain the oil, while the bike is on the side stand, that way, 95% of the oil comes out the holes.
Once it's empty, reinstall the drain bolts, install a new filter, put it on the centerstand, fill to appropriate level.
For any changes in the futre, the plate can stay on.
G