"if your site is on your bow, the level is right" ummm not so much.
check out Hamskea Archery tool and do some searches on 3rd axis. A whole new world will open up to you and i'm sure you'll be shooting better in no time.
The RT 900 does not show a 2nd or 3rd axis adjustment so you'd have to shim for that.
Do some reading and grab a carpenters level.
I like the PSE Top Gun F-22 sight......it has the Axis adjustments.