Is it possible to lock two axes at once?

So, I’m trying to position plants on terrain. I’m doing this in overhead view. I position them where I want them in parallel projection above the terrain, and then use a plugin to drop them so they are touching the terrain. The issue I’m having is that when moving them, they often jump along the blue axis, sometimes causing them to be placed partially into the terrain. Is there a way to lock to red and green axes only, so it can’t move along the blue axis? Or is there another way to position objects over a terrain efficiently?

Try switching the camera to Parallel Projection and the top view. Perhaps hide the terrain underneath if it is present.

hiding the terrain did it. Don’t know why I didn’t think of that. Thank you!

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If you need to place a lot of objects, you can have a look at Skatter ($).