When the strips have seperate plugs you don't have to worry about how they get plugged into the powerstrip. Most plugs are polarized now anyway so they only go one way. Only time it really matters is when your paralell connecting like freakie frog or I do. But I also solder all my connections so it's really a different method for me. And I wouldn't suggest soldering to anyone unless you are very good at it, as its a good way to screw up expensive heat tape.