2 legal co- If height is a issue get smaller units, if height is not an issue get the bigger LEDs. You can keep those smaller units pretty close with no heat issues. My bigger units I keep atleast 2 feet away which is very impractical for tents. You should be running temps around 80 degrees anyways running LEDs. It's not the same as hps with temperature because of the radiant heat hps bulbs give Off. Once I get a house in the spring I might try a couple large units for flower.
My little 90watt 'fireboard' is potent inside of 24" I'm finding. Wilting leaves etc.
I'm used to the lower temps because of the T5s I normally use. I think it extends the bloom time by a bit however.