I tested your proposal in the setup you can see in the picture below. As pointed out in the linked topics, most of the teleporting occurres when the line of sight to the target is broken. That´s probably the reason why it did not happen to you (as is obvious from looking at your picture).
I tested every setting several times to eliminate mistakes (PC official PVP during raid times, patch 07.05.2020, hotfix 08.05.2020 and 13.05.2020).
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The archer on a pillar tower (1x2) did teleport to the ground every time the rhino approached.
Since the rhino arrived from the left, line of sight was already broken from the start. -
The archer on a fondation tower (1x2) did not teleport to the ground.
When I changed the options and only selected “stand and defend” at last it definitively sufficed. (same outcome)
This is remarkable because suddenly something works that did not before? It means either that all of the persons testing before in these threads: archers-behaviour-settings-bug and thralls-walking-through-walls-and-doors-and-being-killed did it wrong or funcom hotfixed some of the mechanisms without mentioning it…
(Well, thank you very much FC then ^^)