FYI : 2016 EURO golf 7 GTI. Don't really see a way to put cable ties on this, because its very close to the chassis.
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You can get them through by prying it out a little bit.
It's held to the chassis with two push pins (you can see the little bumps on the left hand side). They're about 1cm into the metal bracket, so you can easily pry it out by a couple millimetres to get a cable tie through.