I don't recommend DPS1200 for L3+. Leastways I won't sell them to you if I know that's what you're using them on. The first five L3+ that came into my hosting, within a week three of them had set the PSU boards on fire. Looked like there was a flaw with the miner that caused potentially several hundred watts of additional power into one board, because every time the damage was centered around one pair of cables. The 1200 has about 500 watts of headroom over the L3+ stock power draw so it didn't trip overcurrent before the jacks started breaking down from the localized severe overcurrent draw. I could assume it's a flaw in the PCB, except that it happened to 3 of the exact same miner within seven days and not to any other of the same batch of boards, several of which I have powering S9/T9 off 1500W PSUs and they aren't even warm.
The owner of the miners said he saw similar trouble off pairs of Dell 750W, where one PSU would sometimes trip out (less headroom per supply). The L3+ are now driven off pairs of Seasonic 850W and I occasionally have to reset them.

My recommendation for the L3+, use no more than 1000W PSU and keep an eye on it.

My board works with the DPS800, which runs 800W on 120V and 1000W on 200+V, so that might be a viable option. I haven't tested it though.

But for safety I'm also not taking in more L3+ into hosting because I don't want my shop to burn down.