So overall it looks like you can get significantly stronger fields at very close proximity to the magnetic surface using a Hallbach array, however the field strength falls dramatically with distance (as expected) until your gains are likely not worth the physical volume required by the array itself. In short, this means lifting power is enhanced considerably but field “reach” (distance) which might be useful for sensing applications will likely be offset by the considerable brick of magnets you have to use to achieve this.
Or you could just get an m1448a 