Hi @LuisRamirez , chances are the MR42 has been previously claimed by your Organisation so you may not be able to use it.
You don’t need a WLC as these devices are cloud managed but you will require a license which you can buy from any Cisco reseller.
Darren OConnor | doconnor@resalire.co.uk
https://www.linkedin.com/in/darrenoconnor/
I'm not an employee of Cisco/Meraki. My posts are based on Meraki best practice and what has worked for me in the field.