I've heard that the fragrance is dangerous for birds. Now I have, on occasion used a glade plugin with my birds at about the same distance you want. Only when I have guests coming over...to counteract the dog smell

... And the birds seem fine. BUT, it is really strong and I can't keep it plugged in for more than an hour or two because it makes me sick, so assuming that birds have a more sensitive respiratory system, I wouldn't use one. I do use essential oil air fresheners and those smell much better. I believe citrus Magic air fresheners are also safe to use around pets ( I just don't like the smell of them)