There’s a number of ways in which you can drain your kitchen sinks into a grease interceptor. One could use a low profile grease interceptor where the inlet is low enough to connect to. One could partially or fully bury a regular grease interceptor to meet the inverts.
These pictures are of what NOT to do: raising your sink up with metal rods zap strapped to the legs is not an approved method. It’s a matter of time before this fails and if fully loaded with water; will weight hundreds of pounds. This could seriously injure someone.
Please hire certified plumbers to do your installation, ask for their license, insurance and copy of plumbing permit.