The Annke FCD600 have an 81 degree vertical FOV. I have some and can confirm that it looks like 90 degree to me. Their NCD600 only has 54 degree vertical.
The FCD600 does a pretty decent job but not as well with night color as the NCD or Empiretech's full color 180 camera but are well worth...
From the photo, you should be able to use an ohm meter to check what pins correspond to each wire with the little bit of wiring remaining on that female RJ45 plug.
I have used the simple 2 pc split/combine units and they are fair but sometimes can be flaky like @bp2008 mentioned. If I had it all to do again I would double pull my runs even if I thought those runs will never be needed.
The Nanostation LOCO M5 sold by BHP for $67. comes with the 24v passive Poe injector.
The LOCO AC for $49. does not include the injector.
The M5 is old school in that it has 10/100 Ethernet where the AC is gigabit.
Set up a schedule in BI.
Here is an excert from @wittaj post"Using Spotter Cameras to direct a PTZ where to look in an NVR or Blue Iris and setting a spotter cam as a priority in Blue Iris"
"You also have to set a schedule up for the PTZ so that it will go back to the preset once it is done...
You may also try Tailscale. I use both but find it flawless. I have one account that I monitor where Zerotier frequently fails to connect where Tailscale never fails. Setup is a little easier and the devices do not need to be authorized. It provides an IP for each device that you set it up on...