The steam saunas come with their own steamers but not with ozone equipment.The exception to this is the very expensive fibreglass model on the website which has its own oxygen concentrator, ozonator and steamer all built in to the unit.
The footprint of the blue one on the website is about 3 X 3 ft and it's about 3 1/2 ft high.
The Dual-dielectric POG is a good choice for providing ozone to it but you will also need an oxygen regulator, oxygen tank and tubing set.Other great choices in ozonators are the Synergy double cell or Coronaire Maxi.
The steam sauna with ozone is overall great detoxification and as such helps everything work better.
Hope this helps,