The underdog is not the usual underdog where you could hope that they win. Sometimes they might win however this time it is almost impossible . Chelsea is currently doing very good and there is almost zero chance for middlesbrough to win. The odds for double chance is quite low despite the winning chance
Of course, Chelsea is the strong team in this match, so everyone is choosing this team. But I am not sure how the home team will play in this game, we can not underestimate this team. We saw many unexpected results in this season. So my suggestion is better to go with live betting. This is the best option.