It won't be fair to underestimate a team before the game kick-off, maybe lets wait for the ball to bounce then we can say Tottenham Hotspur will be defeated by Liverpool but for now we can't be so sure on that.
People make predictions all the time. It doesn't mean they are underestimating the other team. Tottenham is known to be a very inconsistent team. They can win a team like Liverpool and drop points to a team like Everton the next week. People who believe Liverpool will win have a right to believe so because Liverpool has been better and more consistent than Tottenham even though Liverpool's performance has been declining in the last couple of games.
If you must bet on that game, I suggest you go with over 2.5. I'm sure they score at least 3 goals in the game and I'm also sure of both teams scoring so you can go with that option too, but as for the winner of the match, I can't put my money on any team because anybody can come out victorious. The fact that Liverpool are favourites doesn't necessarily mean they'll win.