It works but all depends on what frame
This
On a HT with optimal length chainstays (ie. chain is neither too long nor too short if you have to add or remove a link), yeah fine… On any kind of FS bike with a hint of chain growth, don’t even think about it!
You’ve got to bear in mind that anybody from Shimano would tell you that ANY 10spd rear mech of theirs will not work on anything above a 36T sprocket on the back. The limitations of the design are being pushed, how far you push them is up to you… Most modern turbo diesel engines can relatively safely be remapped to add 15-20% power across the range (though the manufacturer’s warranty will still be void), but decide you want to go much beyond this and you’ll have to spend a lot of money on a bunch of custom parts to make it work safely…
A Zee looks cool, but for £5 less and with the knowledge I know it works safely, a medium cage SLX wins out for me…