You can take a small piece of rock and place the ric on it and wrap them with wedding veil fabric (available at Wal-mart), make sure its not too tight and it will attach in a few days.
You can also get a small tupperware container, put some small rubble in it and put the ric in on top.
After it has attached to the rock/rubble you can glue it where you want it in your aquascape. Try not to get glue directly on the ric, they can usually survive it but don't like it.