You can glue them, but it's not recommended.
Try putting them in a very low flow area with some rubble for them to attach to. Another option is to place rubble and the recordia in a small bowl in your tank with some mesh over top to prevent them from blowing away. I've had mixed results with that one though. They should attach in a day or so, but might receed into the rubble until they are happy. After that, if they are attached to a small rock or pebble, you can glue THAT on to a bigger rock.
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