I am shocked, saddened and appalled by some of the 'advice' given on this thread. 
No-one should get two puppies at once, it is NOT 'not much more work than one' it is at least three times the work of one. They must be walked seperately, trained seperately, spend time individually with the owner and if you are out and leavng them home alone otgether, they WILL get more attacjhed to each other than you and be very difficult to train because of that. No breeder in their right mind would home two puppies together, nor would any decent rescue.
It is not OK to leave your puppy (or dog) tied up outside all day for three days per week. It is wrecking the house/going through a 'naughty' phase because you are not looking after it properly. EG. you're buggering of to work and leaving it alone. Puppies need company and they need supervision. I have had countless puppies and they never wreck my house because they are properly supervised. A simple solution to the dog escaping the garden would be to keep it in the house. Radical huh? My advice in this situation? Make sure someone is at home with the dog all day or for at least part of the day even if that means leaving your job. (I am serious btw!) or rehome the dog to someone who is prepared to look after it properly.
Can you have a puppy if you are out of the house for two whole days a week? NO is the simple answer. Owning a dog is not a right and if your circumstances don't suit a dog then it's tough luck, don't get a dog. You may be able to find a suitable older dog from a decent rescue, but you would still need to be able to come home at lunchtime or get someone who could. As a rule, 4 hours is the longest a dog should be left. Puppies shouldn't be left anywhere near that long.
Electric shock collars/fences? What happens if the collar malfunctions and causes serious burn injuries to the dogs neck? (this happens) Or if the dog happens to be looking at yoru child when it gets shocked so starts associating your child with the shock, so starts really disliking your child and then one day bites or mauls them? Plus, some dogs get out of the fence and then can't get back in.
People make me so fucking angry sometimes! 