Lots of people would mount the light at 11:00 position and use the push button on the back of the light. When a "righty" is gripping the fwd grip the button ends up right where your thumb is.
You are using a pressure switch so mount it where you want it. I was an under the barrel guy; when the team bought the Surefire M900s there wasn't any choice.
I liked the M900 but I did get a SIM round to the bridge of the nose just under the goggles that left a pretty good scar and the knowledge that leaving that light on will get you killed (not sure what hurt more) as it is the only reference point a bad guy has to aim, ref. TR's comment on off the line of sight or use a strobing technique (get a good class on that first).
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"The rifle itself has no moral stature, since it has no will of its own. Naturally, it may be used by evil men for evil purposes, but there are more good men than evil, and while the latter cannot be persuaded to the path of righteousness by propaganda, they can certainly be corrected by good men with rifles." — Jeff Cooper
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