Both mounting options in the manual assume that the Tapo C720 is mounted exactly on top of the point where the power cable comes out of the wall. 
In my situation however the power cable comes from the side. 
 

as the tapo bracket does not have any gap or space to allow the power cable to go underneath the bracket, what should I do?

I could mount the bracket on the wall while leaving 5mm space for the power cable. Or I could cut out a small piece of the bracket through which I insert the cable. Both not ideal options:(dirt/moisture can come on ; dont like to break new stuff). 
 

do you have any suggestions?

Thanks in advance!