Understand SACM vs SOMEXFON
Mexico separates the two royalty layers:
A recording artist who owns their masters needs SOMEXFON in addition to SACM to collect neighbouring rights from Mexican radio, TV, and public performance.
Mexico is one of Latin America's largest music markets. Artists registered only with SACM miss the neighbouring rights collected by SOMEXFON entirely.
Assuming SACM covers the recording. SACM is compositions only — the master/recording side is SOMEXFON.