According to our research, this stand is compatible with the small "cube" speakers of your configuration.

Hello Gubfan1962 I bought this product 2-3 years ago for my Lifestyle 500 system at the time. I don't know right now which bracket connection the Invisible 300 has. But I had several adapter options for different boxes from Bose. I'm pretty sure these are compatible and everything is included to hang them. I'm not sure, but I wasn't sure at the time either and bought them on the off chance and everything was tip-top and surprisingly easy to hang up. Regards

This article contains only one mount.

Da ich diese nicht damit nutzte, keine Aussage aus Erfahrung, jedoch laut Bose webpage ja https://www.bose.com/en_us/products/speakers/home_theater/virtually-invisible-300/buy.html#stickynav_tab4