I'm suburban, well large rural town, but mine have a run also. There is a 3 mtr x 4 mtr shed partitioned into two with houndhouses etc and a 17 x 7 mtr enclosure. The actual enclosure has been dug out with 3ft retaining walls, then 4ft pool fence on top. I put my dogs in there when I'm not home. Safety and shelter for them, reassurance for me as the gates lock. Even though I have 6ft paling fences and key lock gates around my yard, the run was something I knew was non negotiable for when I was not home (cant trust em in house!!)
I agree with Kala and Di, if exercised regularly, dogs deal well with crating, confinement or runs. I wonder- and I could be wrong- but when you were not outside with your girls, did they tend to hang about near the house? If they did, an enclosed run near your house would do just the trick. The only diff is if they were declared DD then your run has to have a roof.
ETA; so, if they were declared DD (which, incidentally I do believe is a forever label) they have to be: muzzled in public (to me this would mean outside your (hypothetical) dog run in the 1.5 acres if off lead). But if you redid the 1.5 acres of fencing and the dogs were supervised and noone was looking, I'd say only muzzled when unsupervised. Did I make sense? Then there are signs and red/yellow collars. It isn't ideal, but if you either have them inside, outside on lead being exercised til you get fences done, muzzled outside, or in their run when you can't supervise, then you could effectively keep your dogs. The only diff I could see versus how my dogs live is the signs, collars and muzzle which you can avoid using if you supervise.
I don't know if that was helpful, just my thoughts.