Jeff - you mentioned being concerned they will run away indoors. Are you concerned about certain parts of the home not being bunnyproofed and them getting injured, or not finding them or is there another issue? IF it is only certain areas are bunny proofed we use babygates which sometimes keep them in one room and sometimes just slow them down and I herd them back to the room I want them in, (follow and clap) gently of course. I have read where people do use harnesses and just put them on without the leash at first and then once the bun is used to it use the leash. However, keep in mind they lead you not the other way around.
If by loyal you mean close to you carry greens to regain their attention when they stray.
****hope somewhere in this I helped*******