Are you sure it's a Frogspawn and not a Hammer? Wall Hammer corals exist, but I think Frogspawn only exists as a branching variety.
Euphyllia corals can grow in lots of lighting conditions from moderate light to extremely high light, as long as their acclimated to the lighting.
Flow is a bit more critical though. Moderate flow is great. Blasting it with high flow will cause the heavy tissue to rip itself, on the sharp skeleton.
Frogspawns and hammers can be wall or branching...and you don't have to have it on the bottom. I have a huge piece of purple frogspawn which is a wall and have it securely placed in the rocks about halfway up the tank. Hardest part with the wall variety is securing it so it doesn't fall, but if you can do that your fine. Half of my 125 is all branching and wall varieties of frogspawn, hammer and torch :-)