If I'm not home to sign for it can he leave it in my car or where it go to

Yes I'll with your next door neighbor

If it requires a signature you have to sign for it. If your not there to sign they will leave a paper on your door that says sorry we missed you this will happen 3 times before you have to go to the building and pick it up. If it does not require a signature they will just leave it at your door.

Long as it doesn't need to Signature required the driver he or she may leave it at your front door side door rear door or