I’m really sorry but but I do not understand this step :
„All players (your zero’s, too) connected to the LMS with shairtunes2 on it automatically turn into AirPlay devices.“
1 – how do I connect the PI zero on Shaitunes 2 with LMS?
How will LMS know to use Shairtunes 2 for PI Zero?
2 – I must be installed something on PI zero?
3 – What is the difference between using Shairtune 2 or entering an IP in Shairport advanced settings?
PS: I see Shairtunes in the plugins under LMS but when I activate it does not matter but after restarting the option is unchecked.
I am really sorry for all these questions.