Some av’s do work together, but it is never recommended to have two av’s on one system. There is no need for it either. Some malware disables the av’s, so what good will having two do? No good at all. Better is using one av on the system and as backup 1 or two online scanners.

Having two av’s on 1 system mostly lead to conflicts and may even prevent both from functioning at all, as we have explained many times already on this board.