RAK5146 heat dissipation


We are designing a product for a customer using 4 RAK5146 modules placed in a Nebra IP67 case.
I see that the RAK5146 modules don’t come with a heat-sink mounted on the top unlike some other RAK modules.
Is it advised to retro fit a heat-sink onto the RAK5146 to improve the transfer of heat away from the module, into the air inside of the case and to the case itself which is one big heat sink?