I use electric fencing with both sheep and goats successfully. I use the tape (standard horsey one), so they see where it is, three strands with the usual plastic stakes, but it's on a mains charger coming from the house. Our outside boundary has normal stockfencing (sheep netting) plus a top electric wire. The goats have "tested" that one - only once though, and we had no escapes. Watch gates though, mine haven't gone across, only when left open by absentminded goatkeeper....
It is best to "train" them to the fence, hook over a long piece of nice greenery, they will get shocked, and they will know. It does sound cruel, but it's quick and that way they are safe where they should be.
I have horned tups (Shetlands) and they respect the fence as well, but I wouldn't use netting with any animal other than poultry (and that's more to keep the fox out). Sheep will go through netting (especially if it's turned off) and take the whole caboodle down with them.... and eat the poultry food within seconds....
Also I would have thought Boers are a lot calmer than milking goats, and with them being chunkier maybe not so jumpy....