Using multiple card readers in onelocation

[SteveCooper]

We have four card readers and four mobile phones. Although each phone and card reader will connect individually, using the credentials of four different team members, we cannot connect all four phones/card readers at the same time.

This is important to us as we need to deal with a large number of people over the shortest possible time as they register to participate in a sponsored cycle ride.

Is this type of connection of four phone/card readers in close proximity to each other possible? If not, what is the minimum distance that they need to be apart?

Looking at another option, is it possible to use four laptops connected to our online account as four separate team members and make manual payments? They will have the same IP address as they will be using the same mobile wi-fi.

[VanKalkerFarms]

There shouldn't be any restriction on how many phones and square contactless readers can be in an area.  I've had over 10 iPhones/iPads and readers in a 15-meter area.  Each is only connected to one reader.