Add-on access with QB Enterprise?

[sue]

We have an application that puts bills into QB via the SDK. We're
looking into QB Enterprise and wondering how add-ons work with QB
enterprise.

We want the office admin to be able to use the add-on to add bills to
the company file. Does this mean we need to install the company file
with the QB Ent server on her PC (as a multi-user host)? or can she
still use the add-on if her PC has QB but another PC is set up as the
multi-user host?

Also, would things be any different if we installed QB Ent on a server
rather than setting up a multi-user host?

thanks!