Sorry I can't advise about mounts. However...
If they are going to thrive, phals need a lot more light than they can get on a fireplace hearth situated nearly anywhere in a room.
If you go to Big Leaf Orchids (see the sticky post at the top of the forum), and click the "Information" tab at the top of the page, you will find an article on growing and blooming phals written especially for new indoor growers.
A few minutes reading will repay you many times over in health and beauty of your orchids.
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