In masternode coins that are POW I have found that the masternode rewards come after a miner finds a block then its designed in code that a % of that rewards goes to certain masternode addresses.
How does this work on a coin that is full POS? Is it the same concept where after a staker finds a block a % goes to masternodes?
Every block generated sends 40% of rewards to stakers and 60% to masternodes.
You can monitor blocks being generated on the explorer here:
https://chainz.cryptoid.info/phr/