I use dummy buttons in grids - you can assign a theme to the buttons making the background and the border transparent, so they appear as empty space.

# Theme changes for transparent buttons
card-background-color: rgba(0,0,0,0)
ha-card-border-color: rgba(0,0,0,0)
ha-card-border-radius: "0px"
ha-card-border-width: "0px"