Stove (Stove) “Backsplash” – Fire Safety Rules?

I just posted a question about electrical work, and got some great advice – thanks to all who responded. I’m in the middle of a home renovation, and now have another question. I know, this isn’t a "DIY" forum, but when I post there, people almost never know the specific rules, regulations, or norms for Norway. So I hope it’s okay to post here again.

I want to re-do the wall behind my stovetop (all-in-one komfyr, not a cookplate with built-in oven beneath or adjacent). I’m fairly certain that building regs would require me to use something fireproof (or at the very least fire-retardant) behind the cooktop, and my first plan is to use tile (fireproof, easy to clean, wears well). However, I have a couple of questions:

1. I assume that if my stove is 60cm, I’ll have to tile the 60cm directly behind the stovetop. But does the fireproof/-retardant material need to extend any distance beyond the actual width of the stove – say, 20cm on each side, as an example? Or does it simply need to match the actual width? If the latter, is it okay to use either a) typical gips board, painted with hard-wearing paint, or b) veggpaneller similar to thesecut to size. Regarding b), I can’t figure out what these are made of, but does it matter in terms of code/safety? Would wood be against code, even if painted with some sort of fire-retardent coating? Or would it be necessary to use something made of sort of fire-retardant composite material, if such a thing exists?

2. If not using tile for the wall behind the stove, would it be okay to use regular gips board alone, painted, and then coated with some sort of fire-retardant coating?

Sorry for the long questions, but very appreciative for any input. Thanks!