1. For what do you want "20" popovers? Other numbers here are 25,50 and 10.
2. I'm not sure but external container itself can have field validation on name and size.
3. I'm not experienced, but feel there is no advantage using VM in the case. 1 machine deployment can use total memory more dynamic.
4. Windows7/10 can't host 25 simultaneous webd users.
5. Yes, you are wrong only at the calling, 2 machines deployment use "master" and "worker" (not client).