Hi @diegovisionary and thanks for your query.
The Tobii Unity for Desktop API (https://developer.tobii.com/tobii-unity-sdk/) is currently designed to operate with The Tobii 4C and should also work with the SteelSeries Sentry however please bear in mind that extensive testing has not been undertaken with this hardware and software setup (which is now almost 4 years old) but your Unity application should still work.
We would suggest sending the client a small sample program to ensure compatibility first.
Please do let us know if we can provide any further information. Best Wishes.