Trying to align them like that could lead to gaps on more complex buildings.
Usually better to center the mesh on the thin axis (using the edge or center for the wide axis is personal preference really) and keep it on the grid. Sort of like this:
The “notches” at the corner can either be hidden by L-shaped trim pieces, or by extending and tapering the wall a bit.
Such a taper is hidden when the walls are placed end-to-end, and is hard to notice on corners unless you really look.
This trick requires some normal editing to make the bevel appear flat though. Setting up the LODs can be a bit fiddly as well. It could also add some Nanite overhead (if you’re using it) due to the near-coplanar faces. Unless you’re planning a building system for players, using trim pieces might be the best option.