also don't use the screws it comes with, they're generally threaded differently than the stock screws.
but yeah you have to remove those four screws and put them on underneath the housing. instead of risking stripping the screws using a drill, use an impact driver.
I know a lot of people can't throw the variator all the way closed with even the heaviest weights on a stock moby. start heavy and work your way down till you have the pull you like if you're on a stocker.