-1. Website management is very poor for many Chabad Houses. A person contacting the shliach once a month to get updated info is more likely to be accurate than the shliach's own site.
Good luck being able to contact all shluchim once a month and getting a response,
Remember, this isn't the only thing they do
I would guess that you would hopefully have 50% engagement from shluchim that you would be targeting.