If you install it outdoor.
this is the few thing you need to take care.
1) If it connected to the external antenna, then the antenna have to ground to the building ground, as well the RF surge arrester.
2) For you router board or the POE surge protector, you only can ground it to the AC ground but no to the building ground.
*remember, if you done mistake, the ground will become a loop and your devices may damange by the lightning strike, the static charge of the lightning.