Seems like a lot of coin if the goal is to simply show willingness. I get the need for overlapping arcs, redundancy, etc. and s mentioned downthread, tailoring what you deploy and where to what you are looking for. Multiple layers and sensor types probably makes much sense. I don't know the power requirements of such things, but a site with grid power, decent year-round access and south-facing communications linkage would seem to be an advantage. IDK - just pulling thoughts out of my butt here.
Eureka or Grise Fjiord? Can I be there when you tell the missus that's your next posting? Given the comments on other threads about the horrors of being posted to some places we already have, I can imagine what the thoughts of these places would be. A lot might depend on how many people you need on site to run and maintain these things. Given the size of some of the trades involved, even a tasking rotation might become disruptively repetitive. If some kind of 'site security force' is needed, perhaps another role for the Rangers.