I’ve published an Blueprint on the Epic Marketplace to create custom MapChecks via Blueprints. An ability that I felt was always missing considering how powerful the framework is.
It is exposed in C++ and used by many different actors, such as the StaticMeshActor. Now everyone has easy access to it!
https://www.unrealengine.com/marketplace/en-US/product/custom-mapchecks-in-blueprint