creating offline mesh network, without internet , what model i should use? most needs internet

[Abdoh]

hello, i hope you have a great day, 
looking to create an offline local mesh network to make our devices contact one another, most routers i found needs to be connected to a central modem (internet company modem) and it just creates bigger network.

i need to create one big mesh network using more routers with one name, what models should i look into.

thanks in advance

[plemans]

Any of them should do they job if you only need a local network. 

but you might find that many of your other devices won't work. many of my IoT devices need an internet connection to work as they run through an online server

[Abdoh]

so any Netgear router should do the job ? for example (orbi series), because other companies like tp link deco routers need internet connection.

our IoT devices do not connect to outside servers because it just do calculations and sends data locally.

[plemans]

I haven't tried my BE series orbi's without internet but I did on the AC/AX series and they were fine