The split transformer would make it real easy, no disassembly to thread hot lead through, just snap over.  mounting is the most difficult aspect of these type meters. Just make sure to kill the power to the line before installing.

Most of these products don't come with power wires, but you can use any wire.

I've always used the kill-a-wat meters on 120 outlets but when i switched to 240 for miners this seemed more practical.  I was going to make it portable but found it just as easy to install new meter for each use then do simple math as I added or subtracted from PDU.

There are you tube vids on installing the meter.