Hi
Simple Server and Simple Client are basically test applications – you don’t need to have them running (or even installed) – though they can be useful for problem solving. You shouldn’t need to use SyphonInject either.
If you don’t see Vizzable/Ableton as a source in Syphon Recorder (or Simple Client), then it is a problem with Vizzable and the SyphonOut plugin. I know nothing about either of them, so I would suggest you seek help from their creators.
Good luck