Hi Frikkie,
we also use PRTG, you can use SNMP Sensors to monitor APs and also the Controlloer. Also just enter PRTG Server in vSCG as Syslog-Server and put a Syslog Sensor in PRTG for your Controller. e.g. I dont know how many APs you got, but you also can add each AP to PRTG using the SNMP Uptime Sensor or also PING Sensor.
Regards
Peter