It would be very hard to train pups when you work all day. If they are pooping at night it sounds like you are feeding to late. Feed a half hour before taking the dogs out for a half hour. I work nights 11p-7a, So I'm home all day & my husband is home from 2:30 in the day & all night. So my dogs are never alone. We take them places with us when possible. My girl pees & poops around the house. She uses her pee pads most of the time. I would suggest that if they pee on the floor to get another pad out soak alittle up, mop the area then lay that pad down for use in that spot. You may have them all over the place-Then they will think ok I peed here, but I guess mom wants it on this pad, I can do that
I would limit the food to the recommended amount. I take my dogs out first thing in the morning then feed, then back out after a half hour-if they poop sooner try 15 minutes after eating. then hide some treats around the kitchen or get the toys that you can put treats inside to give them something to do. repeat the potty break, feeding & potty again when you get home. It is alot of work but if they arent eating the legs off your kitchen chairs you are luckier then some
Some people leave food out 24/7, it really isnt nessaccary unless they have shown signs of hypoglysemia-just my opinion