Las Palmas vs Atl. Madrid prediction (Over/Under)

For today I will make a prediction from Copa del Rey, Spain and I must admit that my first intention was to pick a money line 2 because Atl. Madrid has a straight series of victories against Las Palmas winning the last six games against them but I thought better and I don't know if Atl. Madrid will force a victory today because this phase of Copa del Rey is playing in 2 legs and that means that Atl. Madrid can afford a draw in this first leg. More than this, Las Palmas is undefeated in the last 12 games disputed on Estadio de Gran Canaria and they played against teams like Real Madrid. I will pick under 2.5 goals because Atl. Madrid has a very good defense, on of the best from LaLiga and they can end this game without getting any goals. I am sure that the bookmakers will drop the odds for this type of bet.