There are obviously several ways you can mount your devices to your tripod head. You need an adapter from the binos to the tripod head if you want a non-strap Mount. The very Best adapter in my opinion is the one offered by Swaro. It mounts directly to the Really Right Stuff Anvil 30 or and dovetail clamp.
The image below shows my Swaro 15x56 mounted to a Gray Ops gamer plate. If you zoom in you can see it. But 95% of the time, I just mount it direct.
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like your setup ... wondering if it is using this Grey Ops plate? What is the Kestral mount? How is it mounted to the Grey Ops plate?
Here is the adapter and how easily it works:
Note that a lot of people (myself included on a second set) use the outdoor edge bino mount. It is about $50 bucks cheaper than the Swaro but not if you need to then put a RRS adapter plate on the bottom. It is a very distance 2nd to the Swaro mount. I have the Vortex at the bottom of some junk bin. Like all screw in mounts they can be a pain to take on and off. Spend the $$ on a good mount.
Below is the link to the thread I did comparing the Really Right Stuff heads.
I do a ton of spotting as well as shooting off the Anvil 30.. It makes a easy to carry tripod because of how compact the setup is.
I used to hunt on the lighter tripods, now my RRS 33 goes not only to matches but is my go to for hunting.. I cut weight everywhere else to offset the extra weight of the tripod. It is just so damn stable; It goes from spotting duty to shooting duty without missing a beat.