A few of my steering setups use a flex cable for push pull. Set so that it is pulling when turning right.
This allows a lot of flexibility in servo placement and cable run.
For a single pushrod it is preferable to have it so that it pulls to turn right too.
On my tunnel I have dual pushrods setup in a push/pull config.
I have used fine wire in a p/p setup too.
So to answer your question.
If you can put your servo anywhere you want, then get it close to the rudder and have the shortest straightest rod to it.
The other methods I have above will give you unlimited options.
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