How to find compatible iOS security apps?

I agree with Mac Jim ID here. You'll find the senior members of this forum, those who have been around for years, will advise against tools such as Norton or ANY Security Software for iPhone. They simply aren't needed and often cause all sorts of issues after being downloaded. A non-Jailbroken iPhone can't get a virus as there are none for iPhone. Apple does an AMAZING job of heading off any opportunities for phones to be vulnerable. Just keep your phone updated when updates are released and there shouldn't be anything to worry about.

You do as you want, but I wouldn't put any of these tools on my iPhone.

You are on your own with that one. Both Total AV and Norton are problematic on their own and there is absolutely no security software that is useful or needed on an iPhone.

Security apps on an iphone are completely worthless.