Kohler generator with 200A non service rated

this package has 14 kw kohler and a whole house transfer switch 200 amp non service rated.

New house built 7 years ago with 200 amp panel . No seperate disconect switch between meter and panel. Can i use this package. Must a service disconect then be installed.

Is anyone familar with this. They are on backorder from kohler and i want to make sure before ordering. I will have electrician install and he said he can install any genny i get . I would like to fiqure install parts cost to make a better informed decision. Thanks