What's a general way to install recovery on a Z3?

I just upgraded to 5.1.1 and lost recovery, but I have an unlocked bootloader. I've looked for hours but can't find a guide for that version of the firmware. I'd like to install TWRP, but I'm not sure if it's kernel-dependent.

Does anyone know which version of TWRP I can install on my phone? Do I need a different version for each kernel, or can I keep using the same one? Where can I find it?