I feel like I've tried so many things that aren't exactly what I need/want. We have 2 cats, a dog, and teen boys, plus I really like walking into a room that smells good, so what's the best fuss-free way to add fragrance to a room on an ongoing basis? I tried an essential oil diffuser but that was more work than I wanted. Candles are out. Is there anything that will slowly release fragrance that I can re-fill maybe once/month?