Black Magic Ultimatte 12 HD TECHNICAL QUESTION

Hello, I have a question about the Black Magic Ultimatte 12 HD. I am dealing with the purchase of BM hardware for the studio, specifically I want to buy three Black Magic Ultimatte 12 HD for three cameras and connect them to our hardware chain from BM (atem, Multiview 16 and so on). I need to know if I connect the Ultimatte to Ethernet, do I have to connect the SDI cables to it and those to the source of the layers (computer) in order to be able to control the G / H Matte, Background ? All our devices are connected to the NAS via Ethernet. Can I send these matte layers and the background, without the need for SDI cabling?
Thank you for your respond
Thank you for your respond
