Subwoofers have adjustable crossovers and volume. The easiest thing to do is to set them too high. If properly adjusted, no you cannot have too much, within reason. The best bass is achieved with four subwoofers carefully placed to avoid standing waves.. this is typically mid wall on all sides… there are some great videos on the physics of this.
Most important rule… if you can hear them they are way too loud. They will completely screw up the imaging and soundstage if too loud. Poorly placed they will do no good.