I see what you mean… Going to Unlit mode helps a little, but only when zoomed in close to the grid. I’m afraid there is not a way to adjust this in the perspective view but again, for accurate placement of assets you can still use the Top, Side, and Front views. Personally, I’ve found once the assets are placed using this method you can easily adjust them in the perspective view for nuance without relying on the grid in perspective mode.