We did a step down install on these panels around the pergola seating area. This was a professional install by masons and a fourth panel was added to the tallest corner panel. The tall panels are braced at the top to the pergola post. Stainless steel extra long bolts were used at the feet into the concrete. We get very high winds at this corner and this cuts down that problem but the install was not a DIY for this modification. Love the look!