Programmatically placing tiles from scriptable tile

Hi folks,
I have a question regarding one scriptable tile functionality that I consider useful but I cannot find any mentions of it.
I've implemented a custom scriptable tile to seamlessly connect wall tiles that I am placing and now I'm trying to make my scriptable tile automatically surround itself by "padding" tiles when placed.
For example, a typical wall in a top-down 2.5d game.

XXXXX - X are tiles I actually place, represent top of the wall.
YYYYY - Y are "padding" tiles that represent side of the wall, that may contain decorations, lanterns, windows, etc; I'm trying to make them placed automatically if there's no obstacle.
However "RefreshTile()" method exposed by scriptable tiles refreshes tiles continuously, not just when the tile is placed, so if I call "setTile" from overridden "RefreshTile", it just leaves a trail of tiles on a tilemap as I move my mouse cursor. Should I implement this functionality using Scriptable Brushes? It feels wrong, because I think Scriptable tile should support something like this. Any insights would be much appreciated.