I am looking at GCP Cloud Armor product. They charge $1 per-rule a month. There is this document with pre-configured rules: https://cloud.google.com/armor/docs/rule-tuning
Can you tell how much of it is really necessary for a small website? I don't want to pay 100s for unused rules.
P.S. although the website is small, there is at least one competitor, who is a malicious person and is almost certainly will try a DDOS attack - this is why I am looking for protection before releasing it, but at an affordable cost*