[Solved] How can I limit plyers to build only 1 Tower of each type? (Tower Defence Map)

[Alry FireBlade]

I want to stop people from spamming Level 1 turrets in my Map.
I know I can limit it with,

• Player Group - Pick every player in (All players) and do (Actions)
  • Loop - Actions
    • Player - Limit training of Rapidfire |cff00ffff[Rang 1 | Level 1]|r to 2 for (Picked player)

but with many towers this is really much work. Is there a less work solution?

EDIT:
Dammit, i just noticed that my plan with the trigger on the top here, won't even work. Players would still be able to built 2 turrets of level 1,2,3,4,5 and so on.

Note for Mods: If a Mod sees it, please remove this Thread, I found a Thread with a solution, so it isn't required to still exist.