The default method for installing wireless LAN access points (APs) is clipping them onto the ceiling grid or rail. Mounting the AP in the ceiling is ideal from a wireless coverage standpoint, but having the AP hanging off the grid is becoming less acceptable as it appears to be an “unfinished” installation. Many end users, building owners, architects, and, frankly, installers, are demanding a more professional, secure, and aesthetic wireless AP installation.
Sometimes the end user will suggest the AP be mounted above the ceiling so it is not visible. Leading enterprise AP vendors Aruba and Cisco, however recommend the AP not be mounted above the ceiling as this will degrade signal performance and potentially lead to increased signal interference between APs above the ceiling.
Wireless designers generally recommend not mounting APs above the ceiling for these performance reasons.
It is also more difficult to diagnose and service the access point when above the ceiling.