@organicshadows Of the three Basenjis I've had, one (Jengo) never had any anxiety at all ever. We could leave him alone for good periods of time with no destruction. On second thought he did destroy two window binds, so yeah... make sure you keep them raised.
My other two do get separation anxiety IF they are separated. When they are together... none. Logan bonded to me quickly when I first got him, which was great, but he got upset anytime I left the house. Once we got Sparkle, he was fine. And is so now. She only gets upset if he leaves the house without her. They seem to require a pack to be happy. Both grew up with several other dogs and have only ever known pack life. Two can be challenging at times, but IMO the pros outweigh the cons.
If you can only accommodate one, I would look closely (observe firsthand if you can) at the temperaments of both the momma and pappa. I'd also try to get a good understanding about how the puppies are going to be raised. My preference would be in a home with a ton of human interaction. I like confident dogs. They seem to have fewer behavioral issues.
However, no matter how careful you are about a selection, things can change once you get the puppy home. You never know exactly how a puppy will react until it does. That's when the work begins. Depending on the puppy... the first year and half can be demanding. Just know that going in. If you get an easy puppy... SCORE!
8 hours alone in a day for a puppy is excessive. If that's a career requirement, which I understand, you might consider an older dog that may be a bit more settled down. You can sometimes find them through BRAT and from breeders. Sometimes breeders keep a puppy or two to grow out and show. Sometimes the dog may not like showing and breeders look for homes.
I've read stories here about people who've lived in apartments in large cities (e.g., San Francisco) and were quite successful for the life on the dog. So a Basenji can work in an apartment. The common success factor seemed to be frequent walks outside to burn off the excess energy many Basenjis seem to have.
Hope that helps...