Pretty sure that in 8.1.1 it is still only possible to connect one Log Insight instance into vROPS - is that correct?
In the event that I want I'm monitoring multiple vCenters with one vRops and say two Log Insight instances - is the correct procedure to forward event from one log insight to the other and pair that one with vROPS? Is there any issues with those forwarded logs appearing in vROPS then?
Yes, you are correct. Still only possible to connect one Log Insight instance to vROps.
I don't see any reasons why you could not setup forwarding and connect one of them with vROps.