Correct is by your definition, not Epics. You should play around with it and see what Epic decided the right position of the Pivot of the asset on the Grid system is.
If it even makes a difference. Because, mind you, different engine versions get code destroyed all the time. What used to be back then may no longer be true.
So if you got time to play, make yourself 5 asset. 4 with pivots at the corners, one with pivots at the center, and see if distributing the meshes makes anything at all change.
To be fair, almost no professional outfit uses epic landscapes on production due to their heaps of short comings.
So in turn, not many paying customer of theirs use the landscape grass, which leads to their usual “it works for fortnite so wgaf” mentality.
Well. Sure.
But like evryone else working out real projects you could drop the landscape and start using meshes - we usually set the grass with the still beta after 10 years™ procedural foliage tools.
Its not as nice for distrivution as the grid system - but then again in newer versions you now get PGC to play with, so it kinda makes up for it.