SVG has been a HC for a grand total of 12 NBA seasons. In those seasons, his team has been top 15 in DRTG 11 times.
Led the league once, been top five in DRTG 4 times. 6th another 2 times.
Obviously this team isn't the same as those past teams, the league is different to his time in Miami and Orlando where most of those times came, take it all with a grain of salt. But in the past, SVG has been able to field good defensive teams the vast majority of the time.