I can forsee problems with hooking modern electronic thermostats in parallel. Back when they were simple mechanical contactors, it'd work fine but some of these electronic ones may not use actual contacts to close the circuit but electronic switches. It's hard to be sure what strange effects might occurr when paralleling different types of solid state switches. A call to the makers of electronic ones, if such can be found, might tell you whether it would work or be safe for the device.
Probably if only one of the paralleled units were electronic it'd be O.k. but if more than one were solid state, I'd be a bit cautious. Tom Fowle
