We just stick a cube into one of their many holes. They have two families a year. They did a lot of damage to an elevated stone patio we had. Inside was settled sand, they had a whole structure of condos. Had to put metal sheeting in between the sand and the bricks so they could not get in there.
Two families with how many babies? 5-8 would be my guess. I don’t know, but they’re prolific here. Thank you for your tip!