I submitted "Case #00397845: Private node server round robin" and was given a complex workaround.
Private locations should be treated no differently than your public ones.
During our POC we were told that monitors that use private locations can round robin the test runs. This is not the case. All PLs run the test at exactly the same time. This creates a load test if a monitor has many PLs and is not desirable. The monitor should run 1 test at a time equally spaced.
Many other vendors have this standard feature and Alertsite should too.