I've tried many different stage set ups for amps and drums, i.e. amps right at the back of the stage, on floor, on tables; drums at the front, back. The combinations are many, some work better than others. Without using monitors, what really successful set ups have been tried, in rooms that hold, say, 2oo-ish people, with a stage, to give the best sound for everyone - audience and players. Any good theories why some things work/ are useless. Basic band - drums/bass/ gtrs/ k'bds and vox.And NO sound man.
Everyone's amp pointing straight into THEIR face. Not the back of their knees. Not the audience. The PLAYER'S face. Arrange the stage so that the drummer is also in the 'line of fire'. Only modify this if the audience really can't hear. But they'll be able to.
If an instrument isn't coming through, everyone else must turn down. That includes the drummer. He CAN rock without belting everything as hard as possible. Really.