It mostly works as long as you keep the player at arms length from the walls. It breaks since DM doesn't draw wallitems on walls that are right in front of you on the left and right. And directly on your side.

(The wall spots illustrated with red arrows. Applies equally to mirror image)
So, as long as the player can't get right in front of the wall, the only thing that breaks is the wall as seen in my first screenshot, in the distance far right. Which is only a very minor visual gaffe one could live with.
So the thing that actually works best is very large open spaces, since player isn't hugging the wall all the time.
Anyway, I got
some ideas one how to fix that, by using oversized wall items that cover more than one wall... Will have to test that later.