Any superglue gel should work great, I would try to find somewhere that you can buy large amounts of it if you plan to have a lot of coral in your tank or ever frag anything. bulk usually gets you discounts to make it worth it with glue.
Gsp likes to self attach to things. Rubber band it to a rock like you would with a softie.
Superglue can sheet a bit when you don't let it cure before putting in the tank. I've had issues with that and palys before because the sheet clung to the heads...