Turret placement is a game of precise geometry, aggro manipulation, and predicting the enemy's pathfinding AI.

Novice players tend to panic and place their defensive buildings directly in front of the incoming threat, often right at the bridge.
Mastering the Middle
When the enemy tank crosses the bridge, its AI will calculate that your center turret is closer than your Princess tower, causing it to walk sideways.

Furthermore, any melee support troops following the tank will also be pulled into the center, bunching them up perfectly for your splash-damage spells.
Wait until the tank crosses the bridge before placing it.A mortar cannot hit units directly next to it.If you use the exact same tile every time, they will predict it with a fireball. Defending Against Siege and Spawners
Against these threats, you cannot use the center pull; you must place your defensive building directly on the river, right in front of their siege weapon.

Similarly, if the opponent is using 'Spawner' buildings (like Goblin Huts) to create endless lane pressure, placement is key to survival.
Enemy ThreatHow to Alter Your GeometryAir AssaultMust be placed slightly higher and more central, as flying units ignore the river and take a direct diagonal pathHeavy Spell PushPlace the building extremely high up by the river so the lightning spell cannot physically hit the building and your tower simultaneously Geometrical Dominance
Every single tile has a specific mathematical value depending on the aggro ranges of the units currently on the board.

Control the geography of the battlefield, dictate the pathing of the enemy, and build an impenetrable wall.

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