Hanging terracing with wood on a steep slope with west orientation

Hello everyone, I want to install some (not continuous) terracing on the steep slope so that I can plant the willows and other plants better. The slope does not slip, is "lightly vegetated," very dry, rocky, steep. The neighbor has already nailed boards at the top on the border, from there my property begins. It looks like this:



I want to achieve something like this:

or something like this with boards

My idea – instead of metal rods or wooden stakes, to use screw anchors.
What do you think about that? Should gravel and dimpled membrane be placed under the boards or Robinia posts?

I'm not quite sure why you want screw anchors. They are usually used as a replacement for pier foundations, not for posts. Option 1 is more visually appealing; the one with the boards looks very improvised. If you use Robinia for the posts, that will also last a very long time.

Thank you very much. Screw anchors only for one reason - the slope is rocky, driving the posts in there will be quite an effort, I thought screwing them in would be easier and the screw anchors hold up better. Do I need to consider [Noppenfolie] and gravel backing (I got this from an instruction)? Or just drive the posts in (thinking about driving them in 100 cm and 50 cm) and lay out the cross rails?

Where you can't drive in rebars because of the stones, no screw anchor will go in either.

Metal poles would also be an option, but I didn’t find any quickly. How deep do the wooden poles need to be driven in - at least 50 cm? You can’t reach there with any equipment, everything has to be done manually.

I also doubt that screwing in is much easier on rocky soil. I would definitely not set wood in concrete as described in the instructions. Eventually, every wooden post will rot, then you can start chipping away the concrete. Better to invest in proper wood.

You drive in at least one third of the post length. There are also drive bells for the drill.