A:AnswerThe Orbi comes with a one year subscription to NetGear Armor which includes Bitdefender Security according to the Armor documentation. I have not downloaded Bitdefender but it certainly looks like it would be compatible and NetGear Armor even encourages you to install Bitdefender.
A:Answer“No”. I have nearly the same situation with an Arlo camera. WiFi to camera was at 2 bars with a 2 year older Nighthawk router. New ORBI10 with mesh extender made absolutely no difference in signal strength despite satellite is 30 ft closer which is still at 2 bars. For the $300, look at other alternatives.
A:AnswerI have added to my existing Orbi system by just buying another Orbi Satellie. It adds easily through the AP. You can also direct connect a device to it by CAT-5 cable to get maximum coverage in an outlying location of your home.
A:AnswerYes! I have Blue by ADT Security system and if you just do a web search for how to split between 5G and 2.4G the problem was solved. Fixed it all by myself in under 5 minutes.
A:AnswerBased on what I read, you max out with 3 satellites via wifi. I have not tried adding an extra satellite via ethernet
https://www.windowscentral.com/how-many-orbi-mesh-points-do-you-need