Are you sure there is underestimation here? The 6th team plays against the 17th and the 5th against the 16th. Moreover, Chelsea and Aston Villa must win to get a ticket to the Champions League, and Tottenham and United are not interested in a positive result at all. In my opinion, in both of these games, it is easy to bet on the favorites. In fact, bookmakers are very generous in giving such odds, even a single bet gives a good profit here.
There is nothing more important for Aston Villa and Chelsea to get full points in this match because they really need points to get a ticket to the Champions League so Chelsea must win the match. Man United and Tottenham are no longer chasing the standings because now they are preparing for the final in the Europa League and I am sure they will play more carefully so that no players are injured.
If we dare to take the risk of betting directly on the team given a big odd, then if they win the match it will actually give us a big profit, even though the bet is riskier. But if the bet we place is small, it seems worth trying because even if we lose, it will not result in a big loss in the bet because we placed a much smaller bet.
What's the point of making a small bet if you see that the odds have good value? Maybe only if you are fundamentally trying to show that you estimate possible outcomes more accurately than the bookmaker and the bet size itself is not important. In this case, a multiple bet on two outcomes will give 1.38 x 1.39 = 1.92, almost doubling the original amount. In my opinion, this is an attractive option for cash betting.