QOL request: 0 height cerb disabled

Just calling for a QOL change to cerberus. It's freqently built at exactly 0 height and it's disabled because it's in water.

This mistake is routinely made in team games.

Either make it impossible to be built at 0 elevation or make it so it can still shoot unless it gets into negative height, probably by getting quaked/tremored downwards.

You'd think so, but even with high arc, the turret turns but never shoots.