Hello I have one Deco M4 in my sons house setup as an access point - I have another M4 which I wish to setup and post to him - can I just set it up as access point with same SSID - will that just work

Hi I need to position one of my Deco M4R units further from a power socket so need an extension cable but can't seem to find exact measurements I need - can anyone help me please .?