Aut cum scuto aut in scuto
Never seen one of those before...
That square shoulder on the back of the 'fish' where it joins the cable is a little worrisome: It's partly bevelled, but I'd be grinding all of that to an angle before putting it behind a wall. The first rule of putting something out of reach is be to make sure you're able to get it back out again.
These kind of pictures never show the firestops.
Yes, the fantasy is always better than the reality