How to establish secure connection between Universal Forwarders and Heavy Forwarders in a distributed environment?

Hi, Good day! We have distributed Splunk Enterprise setup, we are trying to establish secure SSL communication between UF-> HF-> Indexer. We do have certificates configured for Search heads, Indexers and Heavy Forwarders. We have also opened required receiving ports on both Indexer and HF. On the other hand, we have around 200 UF's, can someone please tell me, if we need to generate 200 client certificates or we can use general certificate which we can deploy on all 200 UF's for establishing communication between UF and HF. Thanks, D Vijaya