Will the NME-WLC8-K9 work on the Cisco 3725? Will there be a problem if there is a L3 switch between the router where the NME-WLC8 is plugged in and the L2 switches where the LAPs are connected?
That will work just fine. The ap's will just need to have connectivity back to the to the wlc. Now it depends on how you stage the lap's to be able to join the wlc.