Both is acceptable but i believe that to look in between these two locations is also better.

Please can you tell me that in salaah, where we have to look or keep our gaze in the Ruku position?? At the prostration place or at the feet?

Prayer | March 24, 2014 6:51 pm
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Can a woman follow the congregational prayer from her hotel(mekkah) bedroom if bedroom has “live speaker” link to salah?..or is the congregational prayer of hers invalid, as she is not joint to the rows of people in the mosque, and therefore has to pray fard prayer on own?
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Is sajda sahu to be performed for oversights in sunnah rakaahs also and salahs like tahajjud or ishraq? Or is it only for faradh rakaahs?