I do not use one of these systems, but I can tell you we started with a PVC bridge and it got cut down by the cars, so I moved to a taped down to the track loop, using two telephone wires, (what we do is cut a part cat 5 network cable, and keep the pairs together. You only need one wire, so teh second wire as a back up.) This works great with the AMB system, which is what we use.
I see from the pictures, this system needs to be able to see the eye on the PT, so you only have one option to run a PVC bridge over the track and you will need to mount your PT so the system can see it.
I know that AMB is expensive, but it does allow most to come and race, as most have the AMB PT.
I'm not saying do not look at this, I'm just giving you feed back.