Each Cisco camera requires its own HDMI input if you want to use native camera controls; there is no support for an external matrix switcher as there is with content inputs. You can usually use a DA for mirroring display outputs but think through the display control approach (e.g., CEC, HTTP via macro, RS232 via external control processor, etc.)
Mics depend on what you’re using. Cisco mics direct connect. Third party mics may direct connect (verify electrical characteristics of mic vs. EQ), use AES67 directly to EQ, or an external DSP which then connects to the EQ via analog, USB. or AES67. AES67 requires an option key and must use the link local network ports, although intermediate switches are supported if configured properly.
FWIW- A lot of these complex rooms end up forcing us back to the Kit Pro instead of the EQ since it has more connectors.