I have GSP on almost the entire back of my 45g. As stated above, no need to use superglue, just lean some existing GSP against the side you want it to grow on and it will!
I will say, however, that my GSP has completely taken over my entire tank. Most all the back wall, onto the sides a bit (I try to keep it in check by scraping off), covering over 1/2 my live rock, killed off a frogspawn by encrusting it, growing onto a closed brain coral, etc.
Be warned, looks cool but grows and spreads like a weed!