[2020] Move-It! - How to place buildings without the grid?

Building Anarchy lets you change the placement mode for buildings from "Roadside" to something like "On Ground" - but the mod hasn't been updated in a while, so it isn't in the best place. It might conflict with some mods, but you can always try it. If you encounter any issues, you just remove it again. :)

It only works for ploppables though I think. So for growables you'd likely still need to place them on grid somewhere and then move them.