RTK FIX positioning using CDDIS over NTRIP?

Contemplating purchasing two REACH RS2s for survey instead of a traditional Total Station. Aside from this one specific question, I’m sold.

Our organisation is in Maryland, and while I’ve read a lot about setting up NTRIP subscription services on the REACH RS2, can someone give me a clear answer if NASA’s CDDIS Data Caster will work for getting an RTK Position Fix using a base and rover setup? Link: https://cddis.nasa.gov/Data_and_Derived_Products/Data_caster_description.html

Is post-processing or GCPs a Marylander’s only free option? In terms of Real-time streams I have not found free NTRIP services available in my area (any info to the contrary would be appreciated as well!)