Rector to add types to the code base with 100% confidence

[javaDeveloperKid]

Rector has a few rectors that handle adding types based on the other information in the class or IN the called methods from other classes. My plan is to add as many types as possible to my code base in a few steps. The first step is to add types where I am 100% confident the type is valid and go straight to the production.
So my question is which Rectors handling types can be described as 100% sure. Maybe we should add this information to the rules overview?

Btw. What do you think about globally introducing the concept of safe/risky Rector? PHP-CS-Fixer uses this concept and this is very helpful when you know whether a fixer is safe or risky.