So the simple cheap cloners literally just scan one chip and then attempt to wright that information to another. You shouldn’t use them for the reason stated above of how if there isn’t a strong coupling between the clonner and the chip you could end up with a unusable chip.
At least unusable till you buy a proxmark that is because the proxmark can do just about everything when it comes to RFID. Yes it can clone a chip, but it can also analyze and crack the encryption on more robust chips. The proxmark is a serious tool for security research. It gets recommended here because DT created an antennae that can plug into the proxmark and get great coupling with an x-series chip.