See, I was assuming that with this set up you would cross tie in your stall.
I tried to enforce that at a boarding barn once. I got so frustrated with broken cross ties (that "nobody" had broken), a dirty barn aisle, never being able to walk or take equipment down the aisle, etc., that I took all the ties in the aisle down and rigged sets in each stall. The wash stall was still available if you wanted to apply hoof dressing or do something you couldn't in a bedded stall.
I also had several sets of outdoor crossties.
It only sort of worked. When boarders broke the set of ties in their own stall, they tied to the stall fronts, so then I had broken grates in the stall fronts.
Or they'd be in hurry, bring the horse in and tie in the aisle to a stall front, which is even more dangerous than cross tying, because anyone navigating the aisle has to walk directly behind the tied horse's butt.
So if a tack locker in or in front of the individual horse's stall actually made it more convenient for someone to tack up in the stall, I could really see it working.