What do you mean by “be heard in chat”? . The bots, chat window or the site itself cannot play sounds or music. The only way you can let viewers hear the music is through the player while streaming with OBS, for example. If you are having audio issues I suggest you contact the OBS forums or their support.
Wether or not bots interfere with each other can be hard to say considering they are constantly updated and perhaps not tested for compatibility. Unless you are using the same features, like spam control, in different bots at the same time I think you should be fine.