the fenced issue in South Africa is tricky mate
here are some of my thoughts;
its somewhat different to what is classed/perceived as a high fence operation here, now there are some really small places that are a bit like you would find here in the states but most are not. different place different factors
There can be a critical mass/size to a point where the fence no longer effects the outcome of your hunt for the easier or better (sorry we might get a bit of topic here but i may help some guys or give a different look at this issue) now this is purely from a walk and stalk method of hunting, lets say you get busted by a herd of impala and they take flight the chances are very low that you will get another opportunity at them even with a rifle let alone get within the 30yards you would need to be to get a shot with a trad bow now that they are alert to your intentions. they would take hours to calm down, whether they run 200 meters and stand there watching you or if they went 5 kilometers the places are just too big for the fence to even come into play in the outcome of the hunt, now the fence may stop the animals from leaving the property no question there, but its occurs at a point that you could not humanly pursue them to, hunting on foot.
in my opinion there are other factors that concerns me more.
comes from the ground up, lets say for example that the property is big enough for the fence to never effect the outcome of your hunt, but its poorly managed, overstocked (so that there are more animals for you to shoot), as a result its badly overgrazed, so feed is required, usually 15 yards outside your hide, its not a salt lick or minerals that can be an important in sustaining a healthy heard through hard times, its there to keep them alive, thats why they are there daily outside your hide.
not to say that all places that feed are poorly managed some are very well managed depends, see whats there "how much EDIBLE browse or graze is there on the place"?
that should be used to determine the carrying capacity of the place along with several other factors. Alot of places are unfortunately not managed for the good of the ecosystem...but remember whats not good for the ecosystem can be good to someones pocket, humans are good at that and its a business...Big business.
How about having the only water on the property at the hides? i even know of places that not only have the only water at the hides but they are closed off at night. Crazy hey
Ah the old Africa is almost all but gone, wish i had been around 80 years ago.
there is a compromise to hunt just about anywhere, all factor considered you do what you can.
one thing i will promise is that you will have an amazing time, Africa is a very special place, it will scare your soul with a little flickering flame that will never leave you. I wish everyone could get to experience it if only once.