@JBW Yes!! Thanks so much. Next to Youtube, AI, Prestashop Docs, amm, I was looking through all possible modules and the configuration table but wasn't able to find an example. Funny that exactly the banner module which I activated last week in my shops is gonna help me out here :'D
I was able to take all necessities from that module and now my shop feedback module is taking shape. Thank you very much for pointing me towards it, it's perfect, my values are getting saved, everything works properly 