Hi Fabio (@niphredil),
From what I see of the HP Omen specs, the eye tracker should be mounted in the standard configuration, that is centred along the bottom edge of the monitor as shown in the setup guide. One magnetic strip is all that is needed, the others are spare for you to keep.
With regard to the second issue, the eye tracker should be able to withstand warm temperatures coming from your keyboard.. I suspect the CPU would give out first before the eye tracker did if the temperature became too high!