Lookingup

I have yet to receive my equipment but my house has a dedicated spot for a dish hookup. With the app I went up the ladder to run a check on the app so my question is what is an acceptable %? When I first scanned the sky the highest I got was 78%. If that is acceptable I need a wall mount bracket, if it is not then I will have to explore a different location. Please advise. Thanks for any help. Warren