I want to install and configure varnish with Magento 2 on my server running apache as incredibly impressed with the performance gains. Just wanted to know a bit about configuring SSL with this as have not done this in my dev environment.

I have also however been told by my hosting provider that to have varnish work on my site i can only have one site on my server. Is this correct? My testing shows multiple sites seemingly working fine so wondering what this could be about?