Multi Greenbone on one system

Hi everyone
I’d like to know what if we have more than one (preferably two) installed on one system!
They will be able to scan hosts separate from each other or they affect each other?

Yes you can but I will create a lot of headaches for you and doesn’t make sense at all. Either give your machine enough CPU and memory resources to be able to scan several systems parallel, use different virtual machines or linux containers.