Hi Kevin,
There are blueprint functions included that could be used to determine object placement. A Line Trace detecting -Z can be used to find the z locations of any given spot of landscape (or any object), then you can have the blueprint base object placement off of that. It would retrieve the location data and align the spawned mesh. So if you were to have a House placer for example, it would “drop” the house to the correct height of a randomly raised landscape.
I hope that this helps. If there is anything else I can assist you with, please let me know.
Thanks,
Alexander