^ I don't necessarily think it is the "style" of the jammer that's at-fault.
There have been very successful "self-builds" of modified license plate frames/brackets to house various current top-flight laser diode-based jammers (there's one on RD.net, of a housing that's modified in this manner to offer visually low-profile protection of the rear of a small Mercedes coupe), and I think that the issue here, with regard to performance, is one that's based on the jammer itself, and not its mounting "style."
Similarly, threr have been many videos documenting the relative effectiveness of a single-head diode-based unit to offer JFG performance on the rear of smaller (or favorably profiled) vehicles, and the majority of such setups have been center-mass (rear plate area) bisaed (mounted).
You'll note that I mainly speak of the REAR of the vehicle here - since this is the harder of the two aspects to protect, what I hope to illustrate here is that a centralized/center-mass favored mount, provided that the vehicle presents no undue hardpoints, is very do-able.
And as for the ZR4, although I don't hold much hope for it, I think it is really just too early to "lump" it into the category of "it's just another LED-based jammer," or to say that it necessarily won't be more effective than the ZR3 in terms of rear LIDAR protection. The data is just not there.