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I have to admit that 2.5 goals odds surprised me, I expected 1.65. There are two reasons for odds to be higher for an over, one - the results Betis get since Merlino is leading them, and two - the importance of the match in the relegation battle.
The guests are the reason why I want to bet on over. They're atypical team from the bottom part of the league table and get the points thanks to their offense. Rayo's defense is the worst in the league, but their offense are great. Rayo went over in the last six away matches, and out of 11 away matches, they only stayed under three times. They have more unders at home, but mostly because their weaker opponents close off. However, the under-over statistics for Rayo are 7-18, telling everything we need to know.
Betis' total statistic aren't that favorable, thanks to Merino who changed their game style since he came. We should notice that Real score in every round (expect against Villarreal when Merino was at the bench after the 2-3 series of defeats and was forced to bunker up). Also, Merino's Betis' didn't concede a goal only once, so they're not really a rock solid defense. Ruben Castro is their best player , and their offensive line doesn't look bad so I'm sure he can pierce the hollow defense 1-2 times. On the other hand, Rayo will hardly stay at zero.