In this case, RF Transceiver' mounting method is Surface Mount.For optimal performance, this RF Transceiver module makes use of the Tape & Reel (TR) package.
ETRX357HR-R8 Features
Surface Mount Tape & Reel (TR) package
ETRX357HR-R8 Applications
There are a lot of Silicon Labs ETRX357HR-R8 RF Transceiver Modules applications.