Name of the room + number.
I’ll give the human readable name a bit more info like if it’s a fan (then it’s ‘Kitchen Fan 1’, ‘Kitchen Fan 2’, etc…), but I’ll usually make a group and expose the group to voice and the group would be based on the human name (Kitchen Fan). For most rooms though, I only really care about the room itself, so, “turn off the kitchen lights” is all that’s really needed and that’s handled by the zones.
Dishwashers are a luxury, but they also use a LOT less water than you’ll use manually washing dishes and (as long as you clean their filters and use the right detergent) generally do about as well as a bored person doing the dishes will do (ie every now and then you’ll find one with gunk but not too frequently).
Personally, my household has 3 adults and I would go for the full size dishwasher and figure something else out for storage … It’s also possible the smaller ones might be perfect for baking sheets and whatnot. If you haven’t, try to do a mock layout with painters/masking tape and see what you can make fit in that space to try and help with planning, if you can.
With all that said, worst case scenario if no one wants to manually wash dishes, you have to run it twice in one day, every now and then, which doesn’t seem horrible.