A:AnswerIt can work on either. The little clip mechanism that it comes with is flexible and allows you to sit it on a desk or clamp it (it's not a pressure clamp, so it kind of more just rests on whatever you put it on).
I have mine on top of my monitor. It just sits on top and I bend the clip mechanism to sit against the back of the monitor. It's easy to adjust.+
A:AnswerYou could probably just select the webcam instead of the built in camera you have or just go into settings on whatever you use and just disable the built in cam.
A:AnswerYes, this will plug into your computer via usb. Works great for doctors videoconferencing.
No, you do not need a separate microphone. The webcam comes with a built in mic and works great!
A:AnswerYeh webcam may not be getting enough power through the USB ports, it would probably say so on the screen of the Mac of it isn’t getting the power it needs.
A:AnswerThe webcam comes with a USB cord. For me it was a simple plug and play on a HP laptop. I do not know about the Dell, however, I would assume that as long as it recognizes other USB products, it most likely should work.