Is the unification of the Adhan considered a reprehensible act that one should not assist with, and is it permissible to operate and repair unified Adhan reception devices and to pray for their destruction?

The call to prayer (adhan) is required for every congregation in every mosque. It is not sufficient to rely on the adhan from another mosque, nor is proxy permissible for a unified adhan. Each mosque must call its own adhan, following the example of the Prophet (peace be upon him). The adhan is required even if it is performed in the middle or at the end of the prayer time. However, it is impermissible to supplicate for destruction using sound devices, because the Sharia has prohibited a Muslim from supplicating against himself or his property.