I think it looks great! Yes, a top is safer. Mine are in a topless garden during the day (locked up at night) and have been fine for the last two years. That being said, it is a risk. If you are worried, you could string fishing line over the top, provide extra shrubbery for hiding under, or add a purple Martin house. There are two Martin houses by my ducks and I have seen the Martins attack a red tailed hawk and a great horned owl who flew over head.