Lighting will be your main limiting factor up top on an all LPS tank, but with careful acclimation, you should be able to keep whatever you want up top. I've had a some difficulty making everyone happy in my LPS only tank. Luckily, LED lights make this easy to solve by dimming lights (especially useful in acclimating), but you are more limited with T5. Overall, watch closely for bleaching and be ready to dim lights or move things down if they show signs of too much light. Luckily LPS are very adaptable and I've got a lot of 'low' light corals (blastos especially) right at the tip top of my tank under Hydra HD lights. Just keep an eye on things.
From my own experience, you will have an easier time with euphyllias (hammers, frogs, torches), duncans, some chalices, and favites/favias in higher light, but nearly all LPS can be acclimated to high light. Though most will look better with more subdued lighting.