Best practices for redundant 5412zl

[Exi]

Hello, our network looks quite simple today (5308xl and six 2226).

(5308.pdf)
But we need a "redundant" Network for the Server.
So we are thinking over a solution with two 5412zl and a 5308xl (or more).

(5412-1.pdf)
(Later we will get a second Serverroom for failover)
(5412-2.pdf)

What is the "Best config" for this solution?

Or, is there a better way to do it?
I can admin the 5308xl, but i have never seen a 5412zl.
I read something like VRRP or DST....but what is the way?

Thanks for help
Exi