I use magnet whenever possible. Some SS will work some won't. You can buy the magnets from Rusty. They are 100 lb rated and not cheap, $10 for one. I keep 6 in my box, and could use 10 sometimes for my wrapping methods.
As for the picture above. The plastic is wrapped around a suppression pipe thar wouldn't come loose for removal. The clamps a above a char-broiler that the fire pipe runs into the bottom of. I should have taken a picture without the plastic, this would have been a good one for how not to run yur fire suppression. Maybe it will still be this way next service, it was supposed to have been changed about 6 mo ago.