How do I setup to work with a HDMI monitor?

Use displayport to HDMI adapter/dongle. Inexpensive and readily available.

Does this support a daisy-chain (displayport 1.2) dual-monitor setup - e.g (computer A and computer B each ) -> RKV-18002 -> Displayport 1.2 monitor -> Displayport 1.x monitor so that both displays switch from A to B when the button is pushed?

No, this supports one monitor switching between 2 PCs.

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Rosewill 2-Port USB DisplayPort KVM Switch - RKV-18002

Instant Switching: Includes a button controller to switch between two DisplayPort computers that can be controlled from a single keyboard, monitor and mouse
Plug and Play: Simply connect the PCs you want to control with your set of peripherals; KVM switch supports any combination of Windows, Mac and Linux operating systems; does not require drivers or software installation
4K@30Hz Ultra HD Resolution: Supports DisplayPort 1.1 and HDCP compliant monitors, USB keyboards, USB mice; includes connectors for audio and microphone

Out of Stock