my rejected shares with nicehash was always around 2-3% regardless of the server location. It is now <0.5% after switching over to hiveon.
Hiveon only runs on OS I believe, there is no windows software version, I can't use any mining OS because of internet connection, I use my phone wifi hotspot and I'm sure hiveOS or other won't detect it unless I drive the drivers which isn't possible on these mining OS