u/OverTransportation16

I am new to competitive 40k and trying to wrap my head around utilizing infiltrator units.

I play CSM so I am trying to understand how to best utilize 5man RCR squad.

As they cost 110pts, it seems to me I shouldn't use them like I would kommandos or nurglings (for move blocking the opponent), as they aren't very cheap.

Especially if opponent does not have scout/infiltrator units for me to try to play the infiltrate game with - whats the best way to play these guys? What should my game plan for them be and what should I hope to get out of them?