Well, if you wanted, you could use some small self tapping screws to hold them in place..
But you Prolly won't want to do that.
For the ones on my good, I used a combination of that Automotive Goop and super glue. Holds like a
Tha Kraken: http://www.focusfanatics.com/forum/ford-focus-builds-general-showroom/285082-meet-kraken.html