Backline Turret Damage Increase

We all know that turrets have been feeling really weak right now, but I was watching some pro games, and it is kinda disgusting when people can dive past the outer and into the inner with no problem.

What if Turrets got a buff which doubled (or even tripled) damage if the turret in front of it is still up. Or did like 1.5 times more damage and had a high amount of arpen. This way normal turret dives would still continue to be only somewhat risky, whilst the backline turret dives are much, much more risky.

I am actually in favor of just increasing the power of Turrets in general, but if they don't want to go that far, I would like to see some turrets being safe zones.