hello i am going to set 7 ap in a bar, exactlly 4 of them(one is outside)  are really for customers, the others are used in the internal area where workers are

So i m reading how to to setup the network in order to have the more reliable connection

First thing i have set a ssid only for customer, this is in guest mode and 5g

then i have set a 2.4 ssid for workers (some workers will always stand in the internal area, others will  move around.

I have set the ap to use a narrow band channel , 20 so to ensure reliability (this is what i was told to do form one user here)

Now i want to set the channel. I am reading to use, for example in2.4 distant channel, so 1,6 and 11. What is not clear is to which ap give a certain channel. For what i suppose i should not assign the same channel (for example 1) to 2 adiacent ap, right?so if i have one next to the other ap1 then ap2 then ap3 i should give ap1=ch1, ap2=ch6, ap3=ch 11. Is that correct?

are there tools to analyze an area, the one where i put an ap, for example to scan channel traffic so to make sure that it will work correctly?

am i doing right to use 5g for customer and 2,4 for worlkers?do the customer wifi need their vlan if they are set as guest?

in generally any help would be appreciate

 thanks a lot