One suggestion of making turrets stronger

tl;dr: Its similar in idea to the Inferno Towers in Clash of Clans

Currently towers have this for one of their passives Penetrating Bullets*

• +30% armor penetration
• Unique Passive - Dodge Piercing: Turret attacks can not be dodged
• Unique Passive - Warming Up: Turrets gain 37.5% damage each time they strike a champion (Max 75% bonus damage).
• Unique Passive - Heated Up: After the turret is fully heated, consecutive attacks against the same champion deal 25% additional damage (Max 50% bonus damage).

The two main points I want to focus on is the 30% armor pen and Heated Up

First off, Increase the armor pen up to 50%. That's just a minor point I want to bring up.

But the whole main point I want to bring up is on Heated Up, make it apply grievous wounds. Its suppose to be implying that its fully heated up and ready to destroy. And yet that mundo with his ult going off, even 200+ armor can heal 225% addition damage from turret shots. Make it so that it's nearly impossible to heal and that will be a better buff to towers.