For video up to and including 1080p (1920x1080), Sonnet recommends either the "Moshi Mini DP to HDMI Adapter with Audio Support" or the "Griffin Mini DisplayPort to HDMI with Audio + DVI". Many other adapters are poorly designed and have issues with proper color space.
For video up to and including 4k (3840x2160) which is supported by Thunderbolt 2, Sonnet recommends the Accell B086B-005B-2 Ultra Display Port 1.1 to HDMI 1.4 Adapter.
Sonnet wanted to support both deep server room racks as well as shallow portable racks (the xMac mini server is only 18" deep.) Because we couldn't accomodate the full range of rack depths, we unbundled the rack kits to give the users the flexibility to mount the xMac mini Server in racks 18" to 32.5" deep.
