I don't know about the montis but I have LPS in one of my tanks with 160s. I have also managed to burn a couple corals under the 160s. This is a 6 foot 125 gal tank with 2 160s. I plan on getting 2 more in the next couple months.
My system is pretty new, just 7 months, and I haven't got a lot of coral yet. I purchased 2 kessil 160s in May with the spectral controller originally I was going to use them with my chinese black boxes but the kessils alone looked so much better than the light from the black boxes that I took them off. I don't have any obvious shadows or dark areas on the edges. I think the reason I am able to keep lps in this tank with only 2 lights is that I have 2 islands. The kessils hang directly over them and the corals are on the islands. Currently I have a duncan, frog spawn, a hammer and a pagoda coral along with some zoas and mushrooms. I also have a mini maxi carpet anemone. All are growing. I burned the crap out of a brain, a challice, and some clove polyps. The light from kessils is a lot more intense than it looks. I should have run one of the aclimatization programs when I added them and I might not have burnt them. All my corals are in the lower half of the tank. I don't have any intention of keeping any high light corals in this tank, it is more for fish. I do have a 40b on which I have a 360 and a 2 bulb T5/HO fixture. My plan is to do more high light coral in that one, but so far only 3 frags. Personally if you want a lot of coral I'd go with 360s. You can always turn the intensity down if it is too much and you can always add more fixtures in the future if you need them.
My tank has a center brace so 3 wouldn't work, it was 2 or 4 and I wasn't sure I'd like them. If you have 2 braces 3 would work well and probably be a good choice. You will have more options with 360s. I strongly recommend their controller if you don't have another way to control them.
