Are those hosts (rdsrch5 and rdsrch6 on port 52810) both in a pool? Since monitors can be set on the pool level, you could create one monitor and assign it to the pool, and it would monitor both hosts.
Your monitor should be and HTTP monitor, with the send string something like
GET /CoveoSearchService?versions\r\nHTTP/1.1\r\nHost:example.com\r\nConnection: Close\r\n\r\n
and the receive string
7.0
. You may need to modify the send string host value to something legitimate (or else use a simpler non HTTP 1.1 string like this
GET /CoveoSearchService?versions\r\nConnection: Close\r\n\r\n
)