Add multicolumn mapping for the estimators that need it the most #3068
Description
This is not a Project 13 issue any longer, as it does not require any breaking API change.
We should enable multi-column mapping for all the estimators that support it. Since we don't have time to work on a general solution, we will go for option 1 presented in #2884 (comment).
This will only be done for the estimators indicated in the list in the issue #2884. Going forward we should do it for all others.