Yes you could buy a cheap wifi access point to use however you do run the risk of creating interference and if you set it up using the same SSID the Meraki dashboard will see it as a rogue device, this isn't a problem since you have added the device but something to be aware of.
On a personal note if you don't know much about networks it might pay to get someone who does to help you. You don't really want to be making change to a production network if you are unsure what you are doing.
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