I would have to get my head around them not being pets. I would need a lot of them and there would be high losses.
I am not sure I could handle that.
And then what if they were wildly successful and took over the neighborhood? Would I have to deploy Guinea-hunters to control the population?
It feels complicated!
I think your foxes would prevent any population explosion. Guineas will roost in trees during the summer, but you’d at least have to house them for winter, or buy them new every spring. Guineas will return to a coop at night but they have to be trained to, from the bit I’ve read they need more training than chickens do, as they are basically more wild - less domesticated. Also I heard they call a lot, and some people don’t like the calls.
I go on too long here, but I think it illustrates the kind of mental framework you might have to adopt if you let guineas free range:
I’ve mentioned our previous FedEx delivery guy, he and his wife kept chickens for sale eggs and meat, maybe 25 topping out at 35, in a large flatbed tractor coop with wire flip-down sides, which he moved every day around a large fenced field in summer and parked over the garden in winter. Guarded against fox and coyote by an insanely prey-driven German Shepherd from the field perimeter when they were out of the tractor and inside the field (and the shepherd killed any chickens that got out of the field fence, or if he got into it).
But they also kept guineas against ticks and for some food, and those could roam where they wanted. He was mentally fairly separated from the chickens like an old-school farmer, and they were mainly his wife’s project, but he liked chickens’ personalities I think. So the chickens were semi-pets, but on a regular 2-3 year harvest schedule except for a few favorites. Kind of like
@bgmathteach? He liked watching the gang here do their thing while we talked. He noted the Buckeye’s difference in shape from the breeds they had, their strong legs and wide-body stance (and he couldn’t tell me what they had, they were originally some certain breeds but now all mixed together and his wife kept adding in). He admired their thighs, but not for beauty queen purposes!
Anyway the guineas he did not like. He showed a caring and fondness for chickens but not much for guineas. Not clear why. The ones they kept were so wild and untrained they never got a chance to relate to them? So no love lost when they disappeared, and neither he nor his wife tracked them closely. They were outstanding tick protection and he felt they served that purpose really well. But they were also a sort of property boundary bait, providing an easy snack for predators on the property edges (fox / coyotes during the day when they were on the ground, owls at night). He felt that took a lot of pressure off the chickens.
They are the children that get into trouble, create mischief, and generally give you grey hairs. 
my wee ones are showing zero indications either way. I read Orpingtons take a while show their sex, not as long as silkies but I’ll probably be guessing for awhile.
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