If they are destructive inside then they are bored. Find more toys they can play with while you are gone. I used to keep my dog in the basement when I wasn't home with a large section penned off with xpens so she had room to move around and play but not destroy anything. They need lots to do and probably a lot more exercise. My labby would get lots of offleash play time til exhausted and would sleep for most of the day. Maybe try a long walk before work and have your neighbor walk them again later in the afternoon. I leave my dog alone for 8 hours now while I work and she doesn't destroy anything, it just takes time and training and don't set them up to fail. (penned off area if you want to start to train them to be alone inside where they can't get into trouble). I first let my girl out by herself she ripped up a chair so she was left back in the pen when I was out for a while longer and tried again.