Agree... looks like good placement.
One thing to keep in mind with mushrooms is that they will wander/propagate in every direction from where you originally place them. Think of a slug wandering across the driveway... very slowly. And every 1/2" or so along the slug's trail, a baby slug appears months later. And then those slugs start wandering... you get the idea. If you have a "big picture" of how you want your tank to look coral-wise in a year's time, just factor that in. (Don't get me wrong... I love my 'shrooms
- I just wish I had less of them!)