The best possible camera position is over the center of the bed, looking vertically downward - this position requires the least amount of image correction. Moving away from this position is ok, as the software is designed to correct for it, but as you move further from that, more correction is required, and at some point you begin to lose accuracy. Where that point is will depend on the lens distortion and the bed size, as both of these affect how dense the captured image is across the bed.
For lighting, just be careful not to go too bright. The exposure correction has limits, beyond which you might need to add an ND filter to the lens to block out some light. These can be purchased relatively cheaply.
You can put cardboard on the laser bed to help ‘even out’ the lighting, so your wood or object to engrave isn’t surrounded by the dark honeycomb area. Creating a more consistent brightness over the view of the camera will help the exposure control.