What should I put on the rail of my M&P Pro?

Nothing.

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Nothing

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That's my preference as well.

NB4bappleposthism&pcore

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Do you have the Apex trigger, or any other trigger/sear work done? That's the only other thing I want to do is clean up the trigger some - the uptake is still REALLY creaky. (Best word I can think of to describe it.)

I put the TLR-3 on my XDM. I liked it a lot, but after a year the plastic mount broke. Jim's said it was because I had it too tight. Either way, I've been meaning to call Streamlight because apparently they'll replace it.

As has been noted in previous threads, there is such a thing as too much (in some cases, way too much) output from weapon-mounted tactical lights.

The TLR-1 is an excellent choice. 135 lumens is plenty of light for most indoor applications -- although I can't argue with those who said nothing on the rail may, for some, be an even better option. (There are a lot of advantages to a handheld light for those who've had some training -- including not pointing your handgun at a yet-to-be-unidentified person.) Pros & cons to both.

When you get to 300 lumens, you're at a borderline level of too much light. When you get to the 600 lumen level, you're at the stupidity level for most indoor tactical use. Sometimes less is more.

The issue is illuminating a potential threat vs. illuminating yourself. At the 600 lumen level, indoors, you can't really avoid lighting yourself up (assuming you have white ceilings and/or white walls like most of us).

For coon or hog hunting, the 500-600 lumen lights (and brighter) are great -- 'cause critters don't shoot back.

I'd suggest that the OP do some research beyond what's been posted here by me, or by the "experts." There are numerous aspects to consider.