Handbook of ROCOR Liturgical Practice:

If multiple clergy concelebrate, who does the actual reading of the Entrance Prayers?

If a Priest and Deacon concelebrate, the Deacon reads the prayers with the Priest giving the blessings and exclamations in the usual way. The Priest stands immediately before the Royal Doors, the Deacon to his right and slightly behind him.

If multiple Priests and Deacons concelebrate, the senior Deacon alone reads the prayers, and the senior Priest alone the blessing and exclamations; the others remain silent. The senior Priest stands immediately before the Royal Doors, the Deacon immediately to his right and slightly behind him, and the other priests to their right and left.

If multiple Priests concelebrate without a deacon, the senior Priest alone reads all the Entrance Prayers and exclamations. He stands before the Royal Doors with the other priests to his right and left.