In our Masjid, they use a mike with a fixed stand for bayaans and for the Fardh Salaah.

Question

In our Masjid, they use a mike with a fixed stand for bayaans and for the Fardh Salaah. During the Salaah, the mike is positioned in such a manner that it is right in front of the imam's mouth, right by his lips. This makes it impossible for him to go into ruku or sajdah in a straight line. He has to go around the mike in order to move to the other positions. So sometimes he goes to the right other times to the left. I asked an Aalim about this and he said that the movement away from the direction of Qiblah while dodging the mike is not more than 5 degrees (I'm sceptical about this), which means that the Salaah is valid. Also since the deviation from the direction of Qiblah occurs while changing positions it is OK. The example is if you lose your balance while changing positions then Salaah doesn't break. Finally because he alternates between left and right it isn't consistent and therefore it is OK. Also the entire body didn't change direction. Is this is correct? Is the salaah valid? What should be done if the Salaah is not valid? Should I just ignore this and leave these things to the ulema?