Your light setup as proposed will work for seedling thru maybe 30 days of veg....

At 30 days a good grow will reach about 1 foot...1.5 feet....

They will triple in height during flower....so figure anywhere from 3' to 4.5' of space needed.....

You also need to factor in the height of the containers the plants are in...and the distance from the top to the bottom of the lights themselves.

Yes, you really should switch to HPS if you want maximum yeild and bud.....Floros produce thin bud for the most part and are just not the correct Kelvin for buddage to be maximized.

Can you do what you want?

Yes....by all means.

Can you do better?

Sure....

But for the first try, have your pic....then make adjustments for the next grow