If you go that route, then you have the hot-spot in the middle that's too bright for many corals.
Not an uncommon phenomenon back in the metal halide days.
It means you'll have to stack your rock "stadium fashion" - up high on the ends with nothing but open field under the hot spot.
It's nothing that can't be pulled off, but a 36" x 12" tank like yours (and mine) is not particularly suited to that....at least IMO.
I certainly have no skin on any light you buy or don't buy, and seeing these first hand would eliminate a lot of your questions. Usually that's not possibe...wasn't for me.
But to me this light on this tank is limiting. No, not "bad" and as I said, it's workable. But limiting.
Unless you were replacing a halide installation that had a similar lighting scheme - it might be just the ticket!
By contrast, there is not going to be a hot spot or dim ends on a fixture like the Marine Pro. There is a gradient from front to back, but you have a large, useful light field the whole length of the tank. Somewhat like T5 lighting. There are other vendors of lights like this....and DIY builds like the gu10 build I did.
I'm hawking theory and knowledge, not lights. (Or trying.)
$0.02
P.S. Get a [HASHTAG]#lux[/HASHTAG] [HASHTAG]#meter[/HASHTAG] and a [HASHTAG]#killawatt[/HASHTAG] and while you're at it get a handheld [HASHTAG]#spectrometer[/HASHTAG]. That's about $50 total worth of equipment that'll take LOTS of guesswork out of your reefing experience.