RatOS uses a modular configuration that heavily takes advantage of the config file include and merge logic in Klipper. For this reason, the order of includes and overrides are very important, do not change the order of the configuration unless you know what you're doing.
You don't need to find it anywhere or add it yourself. Read the documentation on overrides. You just enter the section along with the parameters you want to change in your user overrides section. In your case:
It's a bit worrying if the default klicky implementation takes that much print space off your build. It should not be that far into the build plate. Euclid works with the standard bed mesh configuration.
Think of it like this: if you had to travel to the probes position with the nozzle, would you move towards min or towards max. That's your answer to whether it's negative or positive