Why on earth would you want to buy an investment property that you cannot keep an eye on? I have owned a number of rental properties over may decades. My advice buying an investment property is if you cannot get in your car and be there in an hour or so then don't buy it.
You will not have much control over your investment if all your contact with agent or tenants is by phone or email only. If things go wrong, and they do, you want to be able to go bang your fist on the agents desk and ask why. You can drive past and see if the property is being looked after, that there isn't a bikie gang in residence, or the tenant's aren't using the fence palings as BBQ fuel.
Keep your money close. There will be many good investment opportunities in SA.