try posting a pic in a new comment. They often won't post in the original post.

The mirrors aren't on the wall yet but I set them there to give an idea of what it will look like.

I can't do smaller ones because they would have to be super narrow and I wouldn't have any mirror above most of my cabinet. Maybe a big mirror is the way to go.

I think they'll be alright if you hang them with their outer edges in the corner seam of the wall, all the way over! Can you have a sconce installed on the wall in between them then? Then have your soap dishes on the counter for both sinks in the middle or have an oversized soap dish in the middle with two bars on it. I see the issue as that the sinks are so close to the edge (not centered on the counter) one large mirror will bring attention to that IMO. It will be easier to trick the eye with the two mirrors. The mirrors btw you have chosen are beautiful with your vanity. Good eye!

Even if you push them to the corner, they are too wide. Too bad, because they're gorgeous. Either get one more narrow or mirror the entire wall. I actually think mirroring the entire wall would be the better solution since the sinks are so close to the side walls.

These are 18” wide.

Source

I thought the details said 18” wide but on header they say 20” wide. How wide is the vanity. Thus is narrow but tall! How much space do you have over vanity?

I for one am glad you like your mirrors, and that's good to hang them if you can't return them, simple.

Slight disconnect with X on vanity doors.... I've read on houzz how some hang pretty mirrors above nightstands, and then lamps in front.

Another idea might be to mirror the whole wall then hang your mirrors on top of that mirror. With solid mirror surrounding them, the focus won't be so much on the alignment with the sinks.

The placement of those sinks don't appear to meet code. The center of the sink can be no closer than 15" to a side wall.

Love the vanity, I'd do one large mirror there.

Those are beautiful mirrors! But I would suggest one large, wall to wall mirror. You could get two smaller mirrors, but in order for them to be centered over the sinks they would have to be very narrow. I suppose it mostly depends on how much mirror surface you'd like to have, depending on what you'll be using them for (Ex. hair, makeup, etc.).

I do not aim to discourage you, just showing another option - it's a pretty shape for sure.

I say the first ones are beautiful mirrors they would look fine because they’re equal size and cover equal space.

In my opinion, it’s definitely not something people will notice right away unless you’re pointing it out, when people look in the mirror, they are looking at themselves!