Gives you a third eye in the middle of the forehead. Not enough training data to also do them in a line.
Use '3rd Eye', as the base and 'vertical eye' if you want it perpendicular to the other eyes.
Pretty straight forward, works from most angles, but might turn the head a little to show the eye. 'Closed Eyes' leaves the 3rd Eye open about 80% of the time. 'Looking at viewer' and 'looking away' both work pretty well; I didn't train for other gazes, but give them a shot and let me know if they work.
'Vertical Eye' is less effective on general humanoid faces; it does work but you may need to turn up the weight. 'Glowing Eyes' also seems to help, but too much weight on these two together will tend towards more monstrous characters.