Rudder blade position

Hi!

I require your help regarding a problem I’m encountering.

Description: for changing direction of hovercraft i am using rudder blades…now does placing rudder in front of or behind of prop make any difference? And if rudder is placed at front of hovercraft and prop is at the back,what can be the maximum distance between the two for effective function?

Hardware concerned: propeller rudder blade

Software concerned:

Troubleshooting steps already taken:

Additional information:

Thank you so much in advance for your help!

It’s not easy to understand without any images.
However i think it would be better After the propeller as the trust of the prop might straighten the flow.

Exemple HERE