Put the foot into a crevis of a rock, like a pocket of sorts. Place in indirect current where it will get varying move n't but nothing direct because it will move on you. Medium to High lighting... Acclimate to high light.
LTAs like to bury their foot in the sand, you can find a spot you like and dig a hole in the sand, place him in it(foot first), and push the sand up around his base. Just be aware that if he doesn't like where you put him, he'll move to where he wants.