You can either block or de-authenticate guests or block users in Clients menu using the buttons on the right of an entry for a user, but not "delete" them. BTW: where did you get the Controller...

EAPs are access points, not WiFi extenders, so no, the EAP110 can't be configured as an wireless extender.

Both grounding methods are viable alternatives, yes. If antenna poles are grounded already, easiest way is to use a grounding strap from the CPE to the pole. If grounding antenna poles is costlier,...

MarcChamberlain wrote We have and are currently using things more expensive like Cisco APs (Aironet 3700/2600) but noticed that we can connect several phones up but the release time seems to be a...

No, the AC500 hardware controller supports only CAPs, not EAPs.

No, they have no repeater mode. I also do not recommend repeater mode for various reasons. SOHO devices often have repeater modes, but it usually isn't used in professional (aka business class)...