What is the max level mob a spawner can make (skyblock)

[iseeadreamer555]

So I am going to make a zombie farm and I need to know what the max level mob the spawner can make so i can fin what height it needs to be

 

[Patsman]

The content creator SL4TES just made a video on that topic XD

(He only got it to level 267 I think)​