Where to put acf_form_head?

When you want to show ACF’s forms in your front-end, you have to add the acf_form_head function. But where?

I was recently working with a commercial theme who didn’t like the usual place I put this function in, luckily the code below does do the job. It doesn’t get easier than this.

add_action('get_header', 'acf_form_head');