Manage Multiple Clients with Single Netsuite Account

We are developing a System in which we need to be able to access Netsuite data for our clients via API and show it in our platform.
Can anyone please help us in achieving this by answering some of the questions mentioned below ?

Is it possible to have an Netsuite Admin account in which we can Manage Multiple Client accounts i.e
Under One account we should be able to create manage and View Reports for multiple clients like

Client1(aaa.com)
– Manage Bills, Invoice, Customers etc
– View Reports
Client2(bbb.com)
– Manage Bills, Invoice, Customers etc
– View Reports
Client3(ccc.com)
– Manage Bills, Invoice, Customers etc
– View Reports

If Yes, then please let us Know How can we Purchase that account ?
If not, then Can we use One Integration (Client ID/ Customer Key and Client Secret/ Customer Secret)
to access
Client1, Client2 and Client3 after completing authentication process ?

Or we need to Create Integration (Client ID/ Customer Key and Client Secret/ Customer Secret) for each Client Seperately and authenticate them