As an overseas viewer I watch 95% of racing via Replay on Fio.
Despite numerous emails to Flo regarding spoilers and their reply of no one likes a spoiler but not really addressing or making changes within the App.

I find the best way to avoid spoilers is to close one eye hold you hand horizontal across your field of vision make a small crack between your fingers to peep through, open the App via your TV control and hope for the best.

I hope this helps.