I use a wireless headset mic and home and that works great, but travelling means taking the rack-mount receiver. I may still do that.
I do use a Zoom, the H4n Pro. That will be my primary recording device with whatever mics I decide to take plugged into left and right, and the native mics for person 3. I know I have at least one three person interview coming up. Lav mics would make it as easy at it could be in terms of gear, but I'd need XLR ones in order to power them from the Zoom, and they're pricey. I did think about it, but I bought the Ninja V recorder instead and used up my budget. I needed that because of the 30-min recording limit on my Sony camera. I wish they wouldn't do that!
Yeah, the blue looks awesome. It really adds separation and makes it look professional. You have a really good knack of doing excellent work on a limit budget and space !