Unfortunately they do not make an absolute co-witness riser for this at this time, but you could use a co-witness replacement mount such as this: https://www.opticsplanet.com/american-defense-manufacturing-aimpoint-t1-micro-mount-1-piece-co-witness.html or this: https://www.opticsplanet.com/utg-pro-utg-super-slim-t1-mount-absolute-co-witness.html
The Holosun Elite 65 MOA Circle / 2 MOA Dot Reticle Green LED Dot Sight mounts to picatinny rails, so it could be mounted on a SCAR 17S. The Holosun Elite 65 MOA Circle / 2 MOA Dot Reticle Green LED Dot Sight won't have an issue with the recoil of the SCAR17S.
Yes, it is compatible.
It should hold a zero on that rifle. It is rated for shotguns and rifles by Holosun.
The mount is compatible with Weaver and Picatinny rails, so yes, it will work.
Yes, this is compatible with Aimpoint T1/T2 mounts.
Yes, it is.
Yes a lower 1/3 co-witness mount is included.
A High/Low - Quick Detach mount is included.