I fitted them to ours.
I only used two sensors one either side of the numberplate fixture. It's easy to get at the back of the bumper there, to feed the wires through and into the boot via the same grommeted hole as the numberplate lights. Worth using silicone sealant on any exposed connectors to prevent water entry. This is/ was a fault on later TFs, where the reversing sensors go mad when it rains.
Also if you use the reversing light feed for power you get a nice beep to tell you you've got it into reverse!