Yes, it’s an instance which is deployed automatically which handles all Nethesis customers.
Depending on the load, it can have multiple nodes.
It can’t be installed on NS8, at lease we never tried. You need to install it manually on dedicated servers. Take a look to this howto: Install Dedalo Hotspot with Icaro on local servers
Maybe. We do not have payments system inside the platform, all the billing is done externally using the reseller program. But for sure we can review a contribution for internal payments.