Hello,
Rogerbot struggles a bit with canonical last I checked. You've the right set up you want to stop parameters it's especially helpful for stopping people rankings pages on your site like /?this-site-sucks! 
Always remember Rogerbot of any other services are a guide only to help you not a 100% true resource that will help you rank so use them like a tool not an authority.
TL:DR - your set up is all ok! 
