@Paydi You could technically get away with 20 IP Camera's if they're like Ring Doorbell/Secuirty camera style ones. Since you're using an NVR, there will be a contant stream of traffic from each...

@Paydi I would strongly advise against what you're about to do using DECO units. You will have so much WiFi chatter on your WiFi network that it would grind to a halt when you start to use everything...

@Boriy Don't use the ISP supplied router to manage traffic. They're not capable of handling all the traffic that would be generated when you're fully booked (Guests + Staff and other devices inside...

@papagibo Thanks for the tip. This is for a wrokplace, so needs to be properly secured. Don't wanna risk it :)

@R1D2 Thanks for this suggestion. I think this is the route that I may have to go for.

@JSchnee21 Thanks for the info. It looks like I would have to get creative to install these on concrete walls/ceilings with regards to feeting the ethernet cables.