Can I use staples to hold down electric wire?
What's wrong with this: -



What you see above are three things: -


Some cables being bound together by...
A cable tie-wrap which loops thru a...
Self Adhesive, (or screw fixing) Cable Tie Mount


Here's a link

I'm think a paper stapler wouldn't have the strength to pierce a metal sheet plus you can't really control it from breaking the insulation and shorting several wires in seberal different positions to each other via the metal sheet.