I use a single strip of foil and a little scotch tape. Takes 30 seconds to make and attach. Just cover all of the points where your fire button or finger will contact the strip. Easy
I tried with iPhone 8plus and it HAS a completely different touch system which requires more force then foul can give unless you are able to make a short enough trigger that you can press it hard enough :)
Amazon has many of these products on sale www.amazon.com/Controller-Fortnite-Triggers-Joystick-Compatible/dp/B07HKKDKQ3/ref=sr_1_2?ie=UTF8&qid=1542934081&sr=8-2&keywords=asktom
Well, I can honestly say. You can actually just buy these for cheaper then all the stuff you need...lol pliers are $5, scissors are $1-$5, aluminium costs about $1-$5 and a credit card or old SIM card costs you having an account or $10+.