MARVs are almost certainly well above the scale of machinery where the sheer cost per kilogram of a microfusion power plant far outweighs the extra bulk.
A hover MARV isn't worth much to us if the entire Initiative can only afford to build, say, eight of them.
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RZ MARV hubs should be pursued for sweet sweet RZ mitigation and, more importantly, RZ Inhibitors. So RZ-1 South > RZ-3 South > RZ-3 North. If we want to hit regular glaciers, RZ-2 West would be useful, so follow it with RZ-2 East for the inhibitor. Oh, and YZ-16 hub at some point so we can exert more effect on the Nile and Eritrea glacier efforts with its inhibitor, and also might have an effect on one of the secure yellow zone phases. ...Or it'll unlock a new phase. It's possible that a Secure Yellow Zone phase is connected to RZ-7 South, rather than the YZ-16 area. (RZ-6 North/south, YZ-11, RZ-7 South, RZ-1 North, rather than RZ-6 N/S, YZ-11, RZ-1 N, YZ-16).
I'm not going to suggest RZ-4 or RZ-5 (or RZ-8 North), because they're poorly placed for logi support compared to Nod territory.
Of course, other than YZ-16, none of those are YZ sites, and I doubt YZ-16 would bring a refugee wave of any level, given that we've been running RZ Harvesting and glacier mining in the area for years already. YZ-3 and YZ-18 position-wise don't seem like they'd be too provocative against warlords. And honestly, I wouldn't argue against YZ-13 hubs either, as Mehretu's heart lands are in Sourthern Africa, so I dunno if he'd break out the canned sunshine for absorbed territory.