Q1 - is the Tags view in VisualRF intended for RTLS tags or something else?
yes, it's intended for tags, it depends on how the tags are setup. if they maintain an association - then they appear as clients.
Q2 - is there any way to debug / validate the RTLS chirps to make sure they are being received regularly?
there is the rtls log, but in 8.2.4/newer - the log is no longer visible from the CLI, so you'd have to monitor from the system -> status -> rtls collector log view.
keep in mind that rtls support is only from Aruba devices and rtls needs to be enabled from AMP Setup -> General -> Additional AMP Services