Sounds like bunny heaven! Rabbits love to dig, so make sure there if a fence going a foot or so into the ground if you want a permanent run. Does especially will dig massive burrow, but bucks mostly just scratch up the dirt to get at grass roots. They like clover and dandelion the best.
I use a movable run because of how destructive my bunnies are. They will completely destroy wherever i let them touch. A movable fence allows you to fill up holes and let forage regrow, kind of like crop rotation. The downside is that there is no fence going down under the dirt, but if the rabbits are well supervised there will be no problem. If you continually us the same spot for any duration of time, the buns will eat all the grass and make a muddy disaster area.

I built a movable outside playpen for my bun, it has a door with a latch and I sit in it with her as she scares easy if she see’s something moving outside thinking it’s after her. I also have a roof on mine as I have a family of eagles that live across the street from me in a 150 foot high fir tree, they have been there for as long as I have (25 years) I have seen them fly down super fast and grab a squirrel so I’m sure they would like my bun for lunch. just be aware of other animals when your bunnies are outside. I read on a site about a lady who left her bun outside in a playpen and a cat jumped in the yard and her bun freaked out so bad and tried to run and broke her leg cause she ran into the playpen so hard. thankfully her bunny survived and had her leg fixed thanks for a very good bunny doctor.