Easy, less expensive alternative to the above (for those of us on a budget
):
For size 6 screws: silver cleco the nutplate through the threads (of the nutplate) onto the #40 pilot hole in whatever structure you're attaching the nutplate to. Drill one ear #40, insert another cleco. Drill opposite ear to #40. Drill pilot hole up to size 6 (#28). Done.
For size 8 screws: copper cleco the nutplate through the threads (of the nutplate) onto the #30 pilot hole in whatever structure you're attaching the nutplate to. Drill one ear #40, insert another cleco. Drill opposite ear to #40. Drill pilot hole up to size 8 (#19). Done.
Used this method all throughout the airframe, including screwed down baggage floors. No big deal.
Tip: Holding nutplates in place
Drill the hole a tap size under the called hole size. Take the next size smaller thread screw size, IE a 10/32 will take a 8/32 screw, a 8/32 will take a 6/32, 6/32 will take a 4/40 screw. Now the nut plate is centered and can not move when you drill the outer two ears of the nut plate. Actualy you will drill one outer ear and cleco it, then drill the opposite ear. Once riveted, you can drill out the hole to the shank size of the nut plate screw. 
Linear Mode
