Are you going to line the heras panels with electric fence and what sort of space do you have for them?
Once they grow a little, it'll not take them long to figure out that they can lift the panels and get out - the less space they have, then quicker they'll get bored and the sooner it'll happen

(I had a young pig trying to lift a gate off it's hinges and even with me standing on the gate he was still lifting it - I'm not a small person

)
I'd also recommend weighing their feed to begin with - it's easy to overfeed.
But enjoy them - that's why most people keep pigs, great fun to have around
