Keystone Rune Idea: Turret Master

I have an idea for a keystone rune. I'm not good in game design (hence the reason I don't want to put numbers on this idea, unless necessary), but I think I have a decent idea. It can always be modified, of course.

Anyways, here is my idea: As everyone knows, turrets are considered very weak and fragile for a by of people, but Riot seems very satisfied with the current state of turrets in the game. So, to satisfy both parties, why not implement a keystone rune that strengthens your allied turrets? I took inspiration from the now retired summoner spell "Fortify". This keystone would probably be most fitting for the Inspiration path, since it gives you access to rule-bending items that help you defend your turrets in different ways from the enemy team.

Here is how the Mastery would work.

You start the game with 3 activatable items that allow you target turrets and cost 0g, which available on the shop. You can only choose one at a time, you can sell it and choose another one if you want, but the items share a (x)-minute cooldown after any of them is used (so they can't be swapped when one is on cooldown). And the turret affected enters a (x) minute cooldown from being targeted by another Turret Master item.

Now, here are the items:

Item 1: Turret Fortifier Targeted turret gains (x) armor and (x) magic resist for (x) seconds. The resistances are amplified by the number of enemy champions within the turret's range Objective: To increase your turret's resistances, and to defend turret against multiple champion trying to take it.

Item 2: Turret Amplifier Targeted turret gains (x) AD for (x) seconds. If a melee or caster minion is hit by a turret shot, they are instantly killed, and you obtain half their gold. Objective: To strengthen the power of turret shots, and to effectively eliminate swarms of minions.

Item 3: Turret Accelerator Targeted turret gains (x) Attack Speed for (x) seconds. If a champion is hit by a turret shot, their AD and AP are reduced by (x)% for (x) seconds Objective: To increase the speed of turret shots, and to defend yourself against ganks in your turret.

That's everything. Thanks for taking your time to read everything if you did.