I believe the 'dssummary' command is for troubleshooting but will also display your observed EPS in at the receiver. From my experience, you are unable to check this information from the GUI. So the results from your command show an average of 1812 EPS in over the last ten minutes and a average 1742 EPS in over the past 24 hours. I'm not really sure what the data in the parenthesis represent. I guessed it was a percentage distribution of EPS from all my devices.
One important note:
I'd recommened to calculate your environments peak EPS. Simply put, peak EPS is a calculation based on the number of devices and the max EPS they will generate. Peak EPS is usually what can bring down a SIEM, even if the peak EPS is only observed for a few seconds. There is no industry standard for computing this, but there are whitepapers out there that go into much more detail if you're interested. Just some thing to consider
It would be nice to have some clarity around this. For example, with a polled event source - WMI for example - the events for a relatively long period arrive in a very short period of time. So would a 5000 EPS rated device only be able to handle 5000 events collected over, say, a 5 minute polling period? Or can it handle 1.5 million events collected on one burst?
Have you tried the following:
Dashboard Views ->McAfee event report ->McAfee General Views -> McAfee Collection Rate - Events Per Second