You want two pups out of the same litter and will give them a great home.
It has NOTHING to do with the homes quality but what is the best situation when placing a puppy. I would NEVER place litter mates together even if it was the best home I have ever had the pleasure of working with. Even if it ends up in you going elsewhere.
I try very hard to make decisions so each pup has the chance to be in their own home. Why?
Every young pup deserves the right to be able to develop their own INDIVIDUAL personality and have the chance to receive as much one on one attention they deserve even with a stay at home work at home situation. You have 2 puppies that require attention. Attention that you must divide between them. Although older dogs have the ability to be able to share time somewhat, it is very hard with puppies.
You run the risk of having the best dog you ever bred, and possibly a good home ruined. As puppies it is possible that if you raise two litter mates together they may not form the personal human bond that makes owning a dog so enjoyable. You end up with just 2 dogs that live with you. As they grow it can effect each others personality development. It is natural in litters for there to be dogs of lower and higher rank, pushy personalities, laid back personalities. This dynamic is very important to early social development. But as they get older this can have a negative impact on their ability to live in the real world. Or hinder their ability to develop to their full potential. In some cases you may have a dog that is bullied so much it is very shy. In some cases you could end up with a situation that as they mature they no longer get along and fight.
I am careful in screening homes because I want every placement to be as ideal as possible for breed, energy level and time the home has for a dog. I also consider what is the best situation for each dogs best interest. Why would I place 2 puppies into a situation that has a very high chance for failure or be stressful for the pups AND the owners?
Yes, it can be done. In some breeds there has been some selection for more of a pack or other dog orientated mind set. Some breeds of dogs fit well, and yes can be raised well together. But not in the Doberman breed. Ironically yes most people who have Dobermans generally do get another. But not litter mates and there is a significant age and time separation. That can work.
Why do you think EVERY service situation. Police, Search and rescue, Assistance and Seeing eye all foster or place each pup out of each litter into individual homes? It sure as heck would be cheaper and easier not to do this. But they do because it is important that each pup in a litter has the chance to develop away from their litter mates and yes even the breeder.
Just because it can be done does NOT mean it should be done. Getting a pup should be as positive event as possible and one should do everything possible to ensure proper placement. It is NOT fair to the dogs, as far as I am concerned, and is not a good situation for Dobermans.
If you want two pups at once you have to be prepared. Are you ready to care for one puppy, let alone two? One pup alone is a lot of work to train and housebreak. Based on my experience: They are going to need to go to the bathroom at different times, so you will constantly be in and out with them until they are housebroken. If you take them both out together, chances are, they are going to be too busy playing with
each other to go to the bathroom right away. And if one goes, there is a good chance the other won't. You bring them back in the house and all of a sudden (as soon as you get settled) that other pup has to go again. If you are living in an area with cold temps and snow this time of year, this isn't much fun. If there are accidents in the house (and there will be) you are looking at double the amount to clean up. Of course they grow up and learn but it requires a lot of patience. You are also getting two different dogs. Despite them being litter mates. They most likely will have very different personalities. One may be very dominant over the other or they may get along great. Your looking at double of everything. Food, toys, vet bills, etc. Training them will be harder as well. If you try teaching them commands/tricks together, there is a good chance they will just distract each other. If you enroll them in an obedience class (which I would suggest) you have to pay double and you will need someone to go along with you so each can work with one pup.
I think it is good for a dog to have a playmate, they are pack animals after all, but I wouldn't suggest getting them both at once and at the same age.
In summary... It has nothing to do with the home but what can be defined as the best situation when placing puppies. So no I WOULD NEVER place litter mates together even if it was the best home I have ever had the pleasure of working with. Even if it ended up in them going elsewhere.