Most electric portable High Pressure Hot Water Extraction ( HWE) machines are actually pretty similar. They use the same vacuum units and pretty similar water pumps.
Any twin vac machine will do - I'd suggest whatever turns up secondhand in good condition. "Steam cleaning" is a misnomer, they all use warmwater.
Training? IICRC have we'll recognised qualifications, second Alltec as training providers for this, and good service for machines.