I'm not sure whether you are asking how to generate the certificates themselves or how to submit them in Lansweeper. Linux scanning instructions can be found
here. The article explains how to scan both with an SSH username/password combination and a certificate. It doesn't focus too much on the certificate option, as the instructions for scanning with a certificate are largely the same. When you submit the certificate in Lansweeper, there is an info bullet next to the input box with instructions on how to submit it.