Ik have been trying to get Google tag manager in the right place in the border manager (nof 12 and nof 13)
The code needs to be placed right behind body start. I finally found a way that was accepted by google tag assistant.
But I had to put off the option "center page in browser"

As soon as I put "center page in browser" back on NOF puts a div around the code that google provides. (google names any kind of html surrounding it wrong)

I als tried to do it in a text box. but google does not accept the P attribute that comes than.

Anyone any experience with this? I exchanged a number of mails with Nof support. All goodwilling people. But I think that Nof just needs a lit change to do the work properly

if I could find another way to center the page in the browser, that would be a work around