Great lighting makes the difference between average and great photos. After doing hundreds of virtual tours, we have found that using a Master and a Slave flash set up is optimal.
Make sure the flashes are compatible with your camera brand OR compatible with both Nikon and Canon, etc.
One flash is the “Master” mounted on the camera, the other is set to “Slave” in-hand (recommended) OR you can use a wireless trigger mounted to the camera to control the flashes on monopods (trickier set-up). We have found the holding the secondary flash with the main mounted on the camera is very efficient and effective!