A glossy conference table looks nice to persons in the room, but when viewed from a remote site, the gloss reflects everyone sitting around it, and any objects sitting on it. This makes the image visually confusing. The camera needs to be placed either directly above or below the video screen. Conference participants will look at the video image of the other site, so having the camera in line with the screen will enhance the perception that the groups are looking at each other while interacting. Dimmable ceiling lights and good blinds on any windows are needed.
Sunlight streaming in a window is hard to correct in camera settings.
A good set of blinds provides the flexibility to either use the sunlight or block it. If tracklights are installed, brightness is good, but don't get fixtures that radiate a lot of heat into the room. You don't want to roast the conference participants. Portable studio lights can be used to brighten the image and give a more professional appearance. Attention to these details is more important when the focus is on a single or small group of presenters than in more impromptu conference or seminar situations.