加快140 mail address? Help!!

Dear All,

I am preparing to take the premium processing service and submitting my I-140 and I-907 simultaneously. Should I enclose these two filled forms in a package? or in different packages?

There are two addresses for me:

Form I-140 Premium Processing Mailing Address:

Premium Processing
USCIS Texas Service Center
P.O. Box 279030
Dallas, TX 75227-9030

Form I-140 Premium Processing Courier Address:

Premium Processing
USCIS Texas Service Center
4141 North St. Augustine Road
Dallas, TX 75227

Which one should I mail my I-140/I-907 package(s) to?

Many thanks!