Artifacts Question: Banner of the Ruler

Hi everyone, I'm hoping for some clarification for how Banner of the Ruler works - when you place an additional creature in an arena, does it count as an additional point for tax collection purposes? I.e. do you get double the tax income from that arena?

Also, does it only allow you to do this for a single arena, for five arenas, or for all ten arenas? (or 11/13 arenas with one of the tax rings)

I'm assuming it allows you to double up occupancy for all arenas, but that without one of the rings you would still be capped at 10 creatures collecting taxes.