That's a good way daisy chain them, yes... Though I would make one addendum. Instead of linking them all on the same side, I would go opposite sides. For example, when you face your rack, if the outlet connection comes in on the left side, link to the one above from the right side, then the next one up on the left side, and so on. Bit more of a pain, and you'll need more connectors, but here's why...

Electricity follows the path of least resistance. If you have them all on the same side, with the the thicker power cables twisted together at the connections, it's going to go up to the next level, more than it will go through the heat tape. Only the final one in the chain will get full power. This could result in lower and unstable temperatures in the rest of the strips. If you separate the connections like I suggested, it will follow the circuit and flow in sequence, because it has no other choice.