A PA will fit between the bars, up to around 9mm wire thickness. Anything above that won’t fit through. That’s fine, it wasn’t designed for a PA.
I can see the fun of this thing for a play session, maybe use the fact that it provides so much sensation when putting it on and deliberately risk the caged guy coming as it’s being put on, then laugh about that

Folx with dicks on the thinner side may have a very different experience.