Hey, so basically I have been having issues positioning terrain, of any type
Basically it only places on the sea level or below of what I have in front
What you can try doing is creating a base level with a part. Take a part and convert it into a terrain region using a part to terrain plug-in. Once you have that it sort of gives you a new height to work with and it should let you place terrain at that level.
You’ve already answered your question, the Terrain tool ignores Parts.
Try @ComplicatedParadigm’s solution, or place a small area of Terrain where your tool aligns to, then Resize it to where it needs to be.
There is also the Fill tool in the Terrain tools as well.