The output connectors vary between TEKA unit variants.
For the non-GPU and capture variant, you need to use the two full-size DisplayPort connectors next to the Zookeeper output.
For the GPU variant, on the right-hand side of the box there are 4 x Mini DisplayPort connectors. These need to be used — the Engine will not output via the ones highlighted red in the image below.
Output Limitations
The TEKA (all variants) comes with an output limitation of a maximum pixel space (raster area) of 4096x2400 (9,830,400 pixels). This can be split up into multiple outputs however. For instance you could have 4 x 1920x1200 outputs and this would not exceed the output limitations (8,294,400 pixels) so would work across the four connectors. You couldn't, however, have 1 output of 3840x2160 then another of 1920x1080 (that would be 10,368,000 pixels).