Difficult to tell, we can guess what to expect, but it probably is always trial and error, or PDCA , plan-do-check and adapt.
Omnitik 5 is a great device, for many things, but it is omnidirectional, so you lose quite some wifi energy in sending in (and receiving from) all directions.
Still it has some antenna gain, but is omnidirectional in the horizontal plane.
Wifi Requirements for backhaul and client connects are quite different!
So this long range backhaul is better done with directional devices, while client is done with local omnidirectionals.
And how far is "long range"? Do you want to cover every spot there? Are there any trees (always a wifi killer)?
It seems this not an easy setup! Just tried to find this location with Google Lens. Is it this?
https://en.wikipedia.org/wiki/Bendix_Woods
I would try this with SXTsq5ac devices (low budget) along the road, avoiding trees, for PtP, multiple hops, with Omnitik as distribution points and SXTsq ethernet interconnect.
(I use Powerbox Pro for the ethernet interconnect and wAP ac for wifi distribution. Clients get 180Mbps throughput. Roaming time is less than 1 second. This is one L2 subnet. Your Omnitik does both functions ethernet+wifi)
SXTsq5ac-pairs work on different 5 GHz channels per pair, 40 MHz wide, 400Mbps interface rate, 260 Mbps throughput.
Mind the trees!!! Absorption happens in the wide fresnel zones.
Of course the Omnitik work with their own 5 GHz channels (40 MHz max), away from the SXTsq channels.