Insta stik is the best sticking foam there is in my option, I tried them all. Wear gloves. If you wet board with a brush of water, not much. Spray foam to board then kiss board onto substrate, take off and then re stick after 2mins with props under length of timber it's golden in 20ish mins. The addition of water helps speed the foam cure up.
Don't go mental with foam or it will end up where're you don't want it, on doors etc.
You will prob need to use fireboard on a steel too.