There is only 1 generation of MRO. The 2.0 references the size of the dot in MOA.
No, these Trijicon Mounts will either provide an absolute co-witness, or low height for shotguns. A lower 1/3 mount for the MRO can be found by using the link below:
https://www.opticsplanet.com/trijicon-mro-quick-release-riflescope-lower-1-3-co-witness-mount.html
Yes, all models of the Trijicon MRO use the same mounting pattern. So the low mount will be compatible with your MRO Patrol.
Yes the standard co-witness will work for it.
Yes the standard co-witness will work for it.
No it will not. SRO is similar to RMR footprint.
Yes, it will.
It will not. The MSR will work on mounts that are designed for the Aimpoint T1/T2 optic.
It would likely be higher than necessary, for the shotgun in question a low mount would likely be the best option.
It depends on what iron sights you are running on the B&T. The co-witness heights referenced on this page are referncing AR15 height sights. The low may co-witness on the B&T depending on the height your iron sights are.