You would need an Active Display Port Adapter like Accell UltraAV DisplayPort 1.1 to HDMI 1.4. 1 of the 3 monitor connections must be done using a Display port with Active Adapter to DVI/HDMI, needed for both kits and hopefully included in the bundle. You'd be advised to contact them to ensure you get the correct adapter for your graphics card. Only applicable to AMD cards, Nvidia set-up is different.
If your monitors have Display Port on them then adapters are not required as far as i know.