No, it does not allow any rotation.
Yes, the turrets will stay true regardless of the focal plane.
Yes, this should work.
You will want to use an AR height mount. Here is a great Vortex option: https://www.opticsplanet.com/vortex-viper-extended-cantilever-mount.html?_iv_tube-diameter=30-mm
THe Vortex Viper PST Gen II 5-25x50mm 30mm Tube First Focal Plane Rifle Scope with EBR-7C Reticle is not calibrated for .223/5.56.
I would recommend using high to extra-high scope rings depending on the types of rings being used. Email us at Techsales@opticsplanet.com and let us know what type of rings you are looking for so we can better assist you.
This set of rings should work:
https://www.opticsplanet.com/v/pr30-l-vortex-pro-series-30mm-riflescope.html
You may be able to get away will slightly lower rings, but it would really depend on the overall length of the Fulton Armory scope mount that is installed. If you want more clarification, please email us at techsales@opticsplanet.com.
The elevation markings are in two rows, going up to 49.
The rifle scope performs well under most lighting conditions including low light.