Don't know what to do :(

[Karen]

Set up a good long run for them. If you can have a cable stretch from one end of the other yard to the other, then have chain for each that can slide along that, it should give them running room, but still be secure. I'd only put them out there when you are home, of course, for the sake of tangles, etc., but I am guessing they'd get used to it pretty quickly.

I don't know if I've described it well, but it's sort of like how a chairlift works, understand?

[cyber-sibes]

That's a great suggestion, Karen.
Good luck - it does sound like you have some challenges, but don't give up yet, there's a few things you can try.
Take them out for good-length walks a couple times every day. It'll help expend some of that pent-up energy. Do you have a dogpark nearby? That might give them a chance to stretch those legs. As for slipping her collar, can you switch her to a halter for walks? They are not as easy to slip thru.
Inside, you might want to consider using a crate or, better yet, a specific dog-proofed room inside to keep them in when you need to leave. Create some interesting things for them to do- bored dogs get destructive.
As the saying goes, "A tired dog is a good dog".