Please add a Cannon Turret

I feel there is a big gap in the turret types,
Machine gun - general purpose
laser turret - uses energy, slightly longer range but lower damage
flame thrower turret - lots of damage short range

I feel a great addition would be a cannon turret, basically functioning like the tank gun using cannon rounds.
this should be fairly straight forward, longer range, much slower fire rate, high damage, one might argue that they would be too OP especially with explosive rounds, except that explosive rounds also damage your walls or other turrets, in which case, the risk of damaging your own defenses could be a means of its balancing, or it could be like the railgun with a limited firing arc.