I'm guessing omni caps will be the right choice for the situation?
I would run the cards.
Yep. Directional is much better for voice recording.
I used the MBHOs to record my elderly uncle. Set 'em up probably 2' away from him at face level, pointing straight at him. I didn't direct a mic at myself, allowing my questions to be in the background and him to be full on in the pickup.
Also, we just started chatting about this and that before I formally asked any questions. Got him relaxed in the presence of the mics. He'd asked for some time before I turned the mics on, so I switched them on anyway and told him, "oh, we haven't started yet," which was technically true because I hadn't started "interviewing" him yet. Kind of took the pressure off him and after a few minutes he basically forgot the mics were there and just started yammering away. I got some amazing stuff...
You're going to be really, really happy you did this.