Just like me … 
… I think it’s a shame what is happening at Resilio. They worked great for years and now they let it hang. It doesn’t matter to me, but I still see Syncthing as an alternative. Therefore more about that:
I have several Synology Servers and Windows 10 computers and run Resilio and Syncthing in parallel on all devices, except for the Android devices on which the Resilio APP no longer works without freezing with newer Android versions. So that Resilio and Syncthing can work in the same directories, I have determined a set of ignore patterns for the temporary exchange files of Resilio and Syncthing and integrated them into both ignore lists (“IgnoreList” for Resilio, “.stignore” for Syncthing). This also means that a server only runs with Syncthing.
This also gives me a good comparison of the speeds and my experience shows that there are no major differences in deceleration between Resilio and Syncthing. Both are roughly the same, with a slight advantage for Resilio. I think this is immaterial, it is mostly in the seconds range. Sometimes Syncthing is even faster, like Resilio, so I think its better you have some tests for that.
Now to your questions:
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On all Windows computers I start Syncthing via the Task Scheduler and can access it normally via the browser. I don’t use all the tray tools etc.
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On my Synthing installations I have 6 out of 48 peers on “Send only”. The 42 bidirectional ones do not cause any problems, one of the six others causes a bit of grief, there are always a few files that are not balanced, I don’t know why.