Is it necessary for each camera to have an independent video line?
Can. Add video overlay or twisted pair video transceiver. Thousands of dollars and no guarantee. Short distance direct video line is the easiest way to save money. The power of the camera is best on the same socket as the host.
Yes, it can, but it costs a lot, it's not worthwhile. The cable is not very troublesome. A monitor, two lines, a power line, a video line. Long distance power line to 12V power supply box is installed on the monitor head, delivery of 200V to 12V power supply box office, then there is no problem in a socket, if a power line with all 12V and can even monitor the first delivery is not a problem, all right in a plug socket, I do the project for many years such things often happen.
One can also, but you do not use this thing, that set up thousands of yuan, you have a head on a line, so you big power the camera inserted together is no problem, can be inserted together
