Belkin KVM 4 port switch

Hoping for some help with a Belkin Universal 4-Port Dual-Head DisplayPort Secure KVM.

I have a monitor which uses display port and two TV's which use HDMI.

I'm trying to get triple screen display on this Belink KVM and can't work it out.

Here's a link to a very similar KVM however the backside has dual display port / HDMI support.

So far I've tried both TV's under the keyboard / mouse and the monitor in port 4.