Closing Areas With Props

Ok, so the regulars will know I've never fully created a gta deathmatch, I started one and didn't finish it and don't plan on finishing that one as the idea I had at the time doesn't seem like such as good idea any more.

Well, I have another idea.

I need to box the people in though in quite a large area, I believe the 50 props will be enough to do it but I just need the quickest way to do it really.

From looking at the different props the 'Construction Fence' from the 'Barriers' category appears to be the best prop to do this with - correct me if I'm wrong please? (I'm new to this)

I'm assuming this is just going to be quite a lengthy process to do?  I need to make sure there are no gaps people can fit through, is there a quick way to do this rather than the struggle it looks to be?

So I have 2 questions above really, I'd appreciate any response.

1. Is the Construction Fence the best prop to use or is there  better prop? (if so please name which one)
2. Is there a quick way to place these props or is it a case of going the whole way around quickly and then going back to the beginning to fix the actual placement?

I'll just save what I've done so far an continue on when I've had a few answers.