There is no number or type specified in NC law as to what you can carry with your Concealed Handgun Permit only that your permit does not cover anything other than handguns.
Nor are there any restrictions on what you can openly carry. You can, legally carry both rifles and pistols openly because there are no laws against it. And since there are no laws against it, there are no laws against how many you can carry.
Thus you can pretty much carry as many as you want so long as your method of carry does not get into the territory of brandishing or "a manner to cause terror to others"