Perfumers Alcohol and Cyclomethicone Base are two professional choices for room sprays. We would recommend weighing out the oils in ml/g as per the method you wish to use.
For room sprays, the percentage is no more than 5% oil. Adding drops isn't efficient as you could be adding too little or too much. Blend the fragrance oil with the base until clear. Stir solution slowly and thoroughly until solution has cleared. Seal container and allow to stand for 2 to 3 days before using.
For Cyclomethicone used with fragrance oil, you can simply use the normal 10% CLP for use in a non- hazardous base. You would then just need to advise appropriate safety measures of using the mixture as you would per normal room spray procedures.